Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd16c486b7461b1…

MALICIOUS

PDF

57.7 KB Created: 2020-08-17 15:41:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5995b84dbbc3b25a6021598d37ddcc2e SHA-1: 2262ede3f1ceefadffaa2d9beeed8089a2f2f203 SHA-256: 5fd16c486b7461b1a8e41c190f6e678911955c4e0c19dd704e5201370269a311
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One prominent URL, https://ttraff.com/pify?keyword=high+intensity+training+ielts+reading+answers, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to IELTS reading answers and the malicious URL, indicating a lure to a malicious site. No scripts were extracted, but the PDF structure and embedded links strongly suggest a malicious intent to redirect users.

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=high+intensity+training+ielts+reading+answers
    • http://files.voicesofbranchcounty.com/uploads/1/3/1/8/131871484/sawiw_zumudozofe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/0608/9640/files/mediadb._v1._sqlite-_shm.pdf
    • https://cdn.shopify.com/s/files/1/0439/2671/6584/files/97404983075.pdf
    • https://cdn.shopify.com/s/files/1/0428/7607/6188/files/tuguzoterepulut.pdf
    • https://cdn.shopify.com/s/files/1/0433/9440/0412/files/doxisuzowilulepoxe.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/bopofo.pdf
    • https://cdn.shopify.com/s/files/1/0435/1026/8068/files/48332507550.pdf
    • https://cdn.shopify.com/s/files/1/0446/9293/0716/files/6th_grade_vocabulary_test.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/3690874893.pdf
    • https://cdn.shopify.com/s/files/1/0430/9906/2426/files/cabinet_ministers_of_tamilnadu_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/lijizamilalej.pdf
    • https://cdn.shopify.com/s/files/1/0429/4728/1062/files/regebevotipenos.pdf
    • https://cdn.shopify.com/s/files/1/0432/7371/5870/files/acuerdo_comercial_entre_per_y_la_unin_europea.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/25305761601.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/black_bear_mask_template_printable.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_off0000a41c.bin
5f6133c1aef9b68dd3fdd78689c1ea4316a84ba0cf27153f4c8483d891a1067f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA41C 5240 bytes
font_01_sfnt_off0000b5f5.bin
30b6ccd0d1675a3a50043176eeb0abb687921ecb6067b8903462ab96cebfe2ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5F5 10352 bytes

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