Malicious PDF — malware analysis report

Static analysis result for SHA-256 77de81bd1514c85d…

MALICIOUS

PDF

59.3 KB Created: 2020-08-31 13:23:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d00893abf3ffd9cab148f051f77c853a SHA-1: 4a7a0cb221d3920405d4ce09c85cc0cfae00ea55 SHA-256: 77de81bd1514c85d8dd9b0c7064358340fbab7bad91b1376b49b9dfccd660629
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating an attempt to lead the user to a harmful site. The presence of a large number of external PDF links, many hosted on Shopify, suggests a link farm or SEO manipulation tactic to obscure the malicious destination. Although no scripts were extracted, the PDF structure and embedded links are sufficient to infer a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.com/wix?keyword=leatherface+3+%25E0%25B9%2580%25E0%25B8%2595%25E0%25B9%2587%25E0%25B8%25A1%25E0%25B9%2584%25E0%25B8%259B%25E0%25B8%2594%25E0%25B9%2589%25E0%25B8%25A7%25E0%25B8%25AB%25E0%25B8%2599%25E0%25B8%25B1%25E0%25B8%2587
    • http://www.opentle.org
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/7578/7157/files/70462099216.pdf
    • https://cdn.shopify.com/s/files/1/0437/7935/8869/files/clarksville_aviation_weather_report.pdf
    • https://cdn.shopify.com/s/files/1/0434/9722/6402/files/42699573936.pdf
    • https://cdn.shopify.com/s/files/1/0440/2728/1558/files/91286248102.pdf
    • https://cdn.shopify.com/s/files/1/0438/4640/2198/files/55810451063.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0407/files/kilabifixinux.pdf
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/rifuxalujutovu.pdf
    • https://cdn.shopify.com/s/files/1/0440/3996/2774/files/opera_mini_addons_apk.pdf
    • https://cdn.shopify.com/s/files/1/0447/8559/8615/files/buzz_aldrin_return_to_earth.pdf
    • https://cdn.shopify.com/s/files/1/0463/4302/8893/files/compound_pendulum_lab_report_conclusion.pdf
    • https://cdn.shopify.com/s/files/1/0448/0129/4496/files/5th_wave_book.pdf
    • https://static.usrfiles.com/ugd/67e251_9135177d5a5640f4a5538ae774b4c9bd.pdf
    • https://static.usrfiles.com/ugd/5cf23b_7539a13a913c440f99e1047f942c5779.pdf
    • https://static.usrfiles.com/ugd/dba42a_4c2fc6d6106a45888dffab450282a36c.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://www.gnu.org/licenses/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000859e.bin
8a017d73aa6cd596af1008cf3164ef4fac4908e220f7efa2b1b5ce25ff7649f9		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x859E 18296 bytes
font_00_sfnt_off00005efa.bin
5b3346bd74fd24ae594283a1be1d544e833e9df016a7725d7876eadfa1ef7b9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EFA 4864 bytes
font_01_sfnt_off00006f86.bin
16d8f8009d5dde203ee4176971671224ed0b2773f8b9deb46f7940dd9550492a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F86 8368 bytes
font_03_sfnt_off0000b689.bin
0390c172eae5d809a4dc2d3514a61ee8ff5a9af0c533a88d9b39451a0ef63a36		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 11528 bytes

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