Malicious PDF — malware analysis report

Static analysis result for SHA-256 64639d4389c43be8…

MALICIOUS

PDF

72.2 KB Created: 2020-08-29 21:00:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 60c4c7ebdd539082a4ad440cbe1dd350 SHA-1: edbb6e35f26e2fdd651b33f05e540fc9d9bbfb16 SHA-256: 64639d4389c43be8441cb3cc160306ac82f2af205479646d8f1580643671b32f
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, ttraff.com, which is likely used to distribute further malware or phishing content. The document also hosts a large number of external PDF links, suggesting an attempt at SEO poisoning or link farming to increase visibility and traffic to malicious sites. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=definicion+de+manuales
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/7525/4937/files/sidijavowosakibevef.pdf
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/joraxe.pdf
    • https://cdn.shopify.com/s/files/1/0435/3549/9418/files/banner_template_design.pdf
    • https://cdn.shopify.com/s/files/1/0437/8460/1758/files/blue_bells_school_gurgaon_admission_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/1208/8231/files/jejefulumivulilatog.pdf
    • https://cdn.shopify.com/s/files/1/0434/9437/5576/files/countdown_job_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/0332/2269/files/unisa_aegrotat_application_form_2017.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/91428743782.pdf
    • https://cdn.shopify.com/s/files/1/0437/0595/8553/files/don_pito_loco.pdf
    • https://cdn.shopify.com/s/files/1/0433/8502/8764/files/34578012945.pdf
    • https://cdn.shopify.com/s/files/1/0434/1576/5148/files/microsoft_documents_imaging.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4160/files/1931523177.pdf
    • https://cdn.shopify.com/s/files/1/0430/7556/7777/files/sajoludat.pdf
    • https://cdn.shopify.com/s/files/1/0431/8553/7175/files/70512779973.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/jadufodilarunuzilon.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.gnu.org/licenses/gpl.html

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_008_off0000e0e7.bin
98a23751ad40750de0ba93d0a4060aae8bcd95470fcfe6698cbd3cd8332c6ff3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE0E7 20068 bytes
font_00_sfnt_off00007374.bin
b8bc0a36292a82fd69b2cd3e15b250d1a6bf42d41c3e84e23c088c01aad1e4cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7374 8132 bytes
font_01_sfnt_off00008f08.bin
e7aca92aab09750f2a89b522285b25f7c3dd8f4068f549c49b3cc146a4e716e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F08 4872 bytes
font_02_sfnt_off00009f6a.bin
d80836b5e734ca6d43496b2cae775ae164a32a1c7d1a2a39b0ef4fcfb932dcb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6A 7968 bytes
font_03_sfnt_off0000b524.bin
1953b179530631ca85adcf3073d1801532d59d7ec045df9d23b9309e9319db52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 13948 bytes
font_05_sfnt_off000102b5.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102B5 4324 bytes

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