Malicious PDF — malware analysis report

Static analysis result for SHA-256 728ca24f5b3af64c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-21 02:03:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5363ca9db4337642e7770f9450dc2b2 SHA-1: 0582bc8efb0e2184eb2bbedffaa134bd509f1587 SHA-256: 728ca24f5b3af64ce795f2b151cf45406492253a8bd5e366341370976d229268
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a resource about adolescent alcoholism, which redirects to a malicious URL. This indicates a phishing or scam attempt, likely delivered as a spearphishing attachment. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics confirm the presence of malicious redirector links and a link farm.

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.cc/pify?keyword=alcoholismo+en+adolescentes+pdf+2018
    • http://files.klikdesigns.com/uploads/1/3/1/4/131409305/xibujubinivibisa.pdf
    • http://wunululi.elegantmind.org/uploads/1/3/1/4/131407995/muwijevetekaso_befenit_fejuxemivetajo_ranumami.pdf
    • http://potola.harleyeaston.com/uploads/1/3/1/3/131384709/4007d.pdf
    • http://files.gooleegumcreations.com/uploads/1/3/0/7/130738748/maloladavureta.pdf
    • http://mofaxem.taufiorito.info/uploads/1/3/0/8/130874038/nijalogenuni.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9614/6073/files/gre_physics_practice_questions_with_explanations.pdf
    • https://cdn.shopify.com/s/files/1/0433/9027/1642/files/33045038896.pdf
    • https://cdn.shopify.com/s/files/1/0431/4857/4884/files/mupofeburimabugelirujuken.pdf
    • https://cdn.shopify.com/s/files/1/0434/3765/4178/files/sabovozez.pdf
    • https://cdn.shopify.com/s/files/1/0432/1378/3203/files/66858509169.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3444/files/rusogupeneno.pdf
    • https://cdn.shopify.com/s/files/1/0430/0845/8905/files/tri_fold_brochure_sample.pdf
    • https://cdn.shopify.com/s/files/1/0437/1385/5643/files/checkers_strategy_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/13494765703.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/42403050301.pdf
    • https://cdn.shopify.com/s/files/1/0433/5907/6510/files/84391710114.pdf
    • https://cdn.shopify.com/s/files/1/0432/7941/7504/files/dumiromulu.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f3a.bin
24994229c9a44ab742e964f7a0af8691ee7114c97b599906ff874e65c60c729d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3A 5808 bytes
font_01_sfnt_off000072d7.bin
53f18add1990911ae44c5bc81c5e526db72ac9b4bd05393ed6101607c2f4e1e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D7 10816 bytes

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