Malicious PDF — malware analysis report

Static analysis result for SHA-256 163fc0195441cf4b…

MALICIOUS

PDF

109.9 KB Created: 2020-11-03 12:18:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 5abfeceaa7236afd691192a19a0838fb SHA-1: 3a715a259e61ca2f8c0b9d04e14069bca9903221 SHA-256: 163fc0195441cf4b84276a2991467ba1053d973cd772dc386b1ee997f52b3fb8
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains heuristics indicating it is a malicious redirector and part of an SEO link farm. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. This URL is likely used to lead the user to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/123?keyword=kumkum+bhagya+9th+may+2018+video In PDF document text
    • https://cdn-cms.f-static.net/uploads/4367920/normal_5f8da45d4576e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368218/normal_5f8924e12c7e7.pdfIn PDF document text
    • https://nofakefol.weebly.com/uploads/1/3/4/3/134341926/96aea55.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5f8d62931285b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413244/normal_5f9811293eed7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392220/normal_5f926db6a15ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376404/normal_5f9e0fc2ec340.pdfIn PDF document text
    • https://kizuwapeputatu.weebly.com/uploads/1/3/4/3/134375201/2023765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8cc1a3-0e2b-4acb-a96e-d3d94d46cb40/12208260921.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0507/2433/9905/files/zunebi.pdfIn PDF document text
    • https://s3.amazonaws.com/guxosa/irish_dog_names.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3403af7d-409f-4df4-b05d-c0b7370b7fd3/cinderella_ii_dreams_come_true_2002_full_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99a4cbaa-c42d-47c5-ab6a-1be4348a729e/nimodifatinemosemo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/5302/1334/files/street_fighter_4_champion_edition_apk_mirror.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000140f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F4 4824 bytes
SHA-256: 6c054e66890dc8fe8b7964bc0b30195da1045dd41f1ea25154eb37de8c09ab6c
font_01_sfnt_off000151a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151A3 5944 bytes
SHA-256: 39cbc310342ab66d447e0907aa5d3ff03dde4f5c553c8fba049e756f38aa3c25
font_02_sfnt_off000165c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165C6 14852 bytes
SHA-256: e62f727584f77e09e74760d74c97188c1c6a1ac781acd1cb054aa3acc7ba30bc
font_03_sfnt_off000194c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194C2 16136 bytes
SHA-256: 7139fe71c37d0e216d07a316a04539027c0b86d4a2fccc609178093b3ffc302c

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