Malicious PDF — malware analysis report

Static analysis result for SHA-256 10376cd8d3b2a034…

MALICIOUS

PDF

69.3 KB Created: 2020-08-15 02:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 44152c8c0d33388dde7410b7c40d79be SHA-1: 0c220fdb3e7bc949e39e7f79ea9f4a378923a0a6 SHA-256: 10376cd8d3b2a034589ec78639b9841ad4dfee5319a415d218895ed8e0c44076
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found by heuristics, suggesting an attempt to lure users to malicious content. No scripts were extracted, but the link farm and redirector are strong indicators of a phishing or malware distribution attempt.

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=ascap+performance+fees
    • http://files.hdloolbox.com/uploads/1/3/1/3/131384777/9f804.pdf
    • http://tisud.assemblyserviceil.com/uploads/1/3/1/4/131407995/cda8d8.pdf
    • http://kepuzonem.morganestatesales.com/uploads/1/3/0/8/130874493/535332.pdf
    • http://files.showjumps4sale.com/uploads/1/3/0/7/130740571/8558149.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/3598/9915/files/nenuwafakijigeroporez.pdf
    • https://cdn.shopify.com/s/files/1/0431/5083/5876/files/xotode.pdf
    • https://cdn.shopify.com/s/files/1/0428/3321/5644/files/lozij.pdf
    • https://cdn.shopify.com/s/files/1/0436/9822/5320/files/49670693241.pdf
    • https://cdn.shopify.com/s/files/1/0433/1195/6126/files/10329896364.pdf
    • https://cdn.shopify.com/s/files/1/0433/7201/9877/files/ubuntu_shared_folder_virtualbox.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/31651487520.pdf
    • https://cdn.shopify.com/s/files/1/0438/5210/3842/files/88920597102.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/62996853258.pdf
    • https://cdn.shopify.com/s/files/1/0432/5038/5051/files/psicologia_papalia.pdf
    • https://cdn.shopify.com/s/files/1/0431/2986/4343/files/basic_english_grammar_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0431/8432/4770/files/zotimizirejepinosupapit.pdf
    • https://cdn.shopify.com/s/files/1/0431/0256/8599/files/fanenuzuxipexip.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_off0000d1fc.bin
5a6057f2330ecd3c9aba0a9a8ca92cffb2b4d3aa1cd6d1d538b772a70844477e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1FC 5116 bytes
font_01_sfnt_off0000e348.bin
0dc578d47d6eaee39a63d507f316ba48837a7662459f84fd11d09e6ed1b15484		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE348 10800 bytes

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