Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0849ef53b409a91…

MALICIOUS

PDF

54.8 KB Created: 2020-08-24 00:29:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f49938b89bc84baa447c586410f8d95 SHA-1: d9ce40112204fb01292cf45e2691808ac0ccc262 SHA-256: b0849ef53b409a9129bb2f2d2645d4a80e63b41bb5842c8b6d2d376c1ec557c8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged as malicious by a machine learning classifier and contains a link farm pointing to numerous PDF files, likely for SEO manipulation or to distribute further malicious content. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=dj+alesso+songs', is identified as a known malicious redirector. The document body is heavily obfuscated but contains references to the redirector URL.

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.ru/pify?keyword=dj+alesso+songs
    • http://files.englishiskillingme.com/uploads/1/3/0/7/130775400/3881414.pdf
    • http://bujoli.twinlakeswaterskiclub.com/uploads/1/3/1/1/131164199/73218c24.pdf
    • http://files.faithchapelberlin.com/uploads/1/3/1/3/131383775/fixijagowafeniwe.pdf
    • http://files.leannestothert.com/uploads/1/3/1/4/131453823/c86538e2abada1.pdf
    • http://files.egtny.com/uploads/1/3/1/3/131381109/4181577.pdf
    • https://cdn.shopify.com/s/files/1/0440/5159/5429/files/la_mthode_simple_pour_arrter_de_fumer.pdf
    • https://cdn.shopify.com/s/files/1/0431/3242/0250/files/riguwebewarijaxi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/vimojep.pdf
    • https://cdn.shopify.com/s/files/1/0428/7243/8947/files/bikez.pdf
    • https://cdn.shopify.com/s/files/1/0434/2313/7957/files/61903656330.pdf
    • https://cdn.shopify.com/s/files/1/0436/1447/0302/files/85707533761.pdf
    • https://cdn.shopify.com/s/files/1/0435/3274/6906/files/44128997767.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pelezegagujagemubejapo.pdf
    • https://cdn.shopify.com/s/files/1/0447/3962/5111/files/human_ecology_theory.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/nubenefibisi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pufabupenidobuxix.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000076fb.bin
d99de761cdf85a5cc9f14eaddf7bb90a349a62957ae88e797f0d5e20bea4c97b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76FB 6548 bytes
font_01_sfnt_off00008cb3.bin
f937370c5d80e9e74a4c0d772e619d446135b02a74558b238843a5ddbe755aaa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB3 4492 bytes
font_02_sfnt_off00009c07.bin
c0f09e0592078f63c20c417827ee5f0975be0290fb112833ec9aa1384fe49df1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C07 10356 bytes
font_03_sfnt_off0000bf88.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF88 4324 bytes

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