Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a2ac4a8812ab2a2…

MALICIOUS

PDF

55.3 KB Created: 2020-08-10 19:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c5f4255c37c74e1963859ac2630e099 SHA-1: e571d53991e73e63bcf0014486d9cca7416ae96d SHA-256: 5a2ac4a8812ab2a25ab8e30969c9018a80bf4f415bb240b645b9f0309ad5393e
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple critical heuristics indicating it is a malicious redirector and part of a link farm. The embedded URL `https://ttraff.com/pify?keyword=the+arabic+language+its+role+in+history+pdf` is a key indicator of this malicious activity. The document body, though heavily obfuscated, contains this URL, reinforcing its role in the attack.

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/pify?keyword=the+arabic+language+its+role+in+history+pdf
    • http://files.flashforge.com.hk/uploads/1/3/0/7/130776602/5607295.pdf
    • http://files.youthultimateprogram.org/uploads/1/3/1/4/131437515/weluwef_sizuwagepikosix.pdf
    • http://kuzapup.rickerskinderkamp.com/uploads/1/3/0/7/130775320/sujose.pdf
    • http://files.dynamicstillnesses.com/uploads/1/3/1/3/131378990/bafek.pdf
    • http://files.oralsurgerygroupinc.com/uploads/1/3/1/4/131453494/4473462.pdf
    • https://cdn.shopify.com/s/files/1/0429/7470/7868/files/79420497910.pdf
    • https://cdn.shopify.com/s/files/1/0433/6697/3598/files/pikata.pdf
    • https://cdn.shopify.com/s/files/1/0437/1336/4121/files/jejolozuwibira.pdf
    • https://cdn.shopify.com/s/files/1/0435/4929/4756/files/git_pull_force_update.pdf
    • https://cdn.shopify.com/s/files/1/0428/1411/1903/files/16295909707.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/robujoluromixofi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5196/5855/files/basics_of_computer_mcq.pdf
    • https://cdn.shopify.com/s/files/1/0430/1550/4029/files/rasaxujumutifuwurowosuj.pdf
    • https://cdn.shopify.com/s/files/1/0452/6519/1073/files/infosys_campus_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/6200/1825/files/wewijuri.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/69222556895.pdf
    • https://cdn.shopify.com/s/files/1/0427/9861/2636/files/center_tapped_full_wave_rectifier_with_capacitor_filter.pdf
    • https://cdn.shopify.com/s/files/1/0433/6104/2591/files/international_bill_of_rights.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000099ad.bin
e17881ef1b1d5c6373bc1a7f8d98e71d6dae730b2863dfa1d62a8ad804c35318		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AD 5608 bytes
font_01_sfnt_off0000acb9.bin
f17d7149f84b4c716734fdcb5243a0ea683f9defbfbdc5b196eaae18aba14870		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACB9 10224 bytes

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