Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fb31769893b054b…

MALICIOUS

PDF

44.3 KB Created: 2020-08-05 16:45:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4abef51755cbcd915c0e9913a0fe2eab SHA-1: e7ba567d94d14ccd212440b39448c0b0b510c210 SHA-256: 0fb31769893b054b94572815c9f12aa50417d7a2de055e2b88701270f3473aa2
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 external PDF files, suggesting a link farm for SEO manipulation or to host malicious content. One prominent link, 'https://ttraff.com/pify?keyword=10th+class+maths+solution+pdf+fbise', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, indicating its importance in the attack chain. The ML classifier also strongly flagged this PDF as malicious.

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=10th+class+maths+solution+pdf+fbise
    • http://files.kittyangel.org/uploads/1/3/0/8/130873718/d00a21c.pdf
    • http://ziginodin.eliclothier.com/uploads/1/3/1/3/131384635/bezesotapob.pdf
    • http://dunatiwu.tinydreamsfarm.com/uploads/1/3/1/4/131483337/lazabivid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuxopikuxoxixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/4937/7174/files/10758866023.pdf
    • https://cdn.shopify.com/s/files/1/0436/9452/2518/files/53754828016.pdf
    • https://cdn.shopify.com/s/files/1/0430/0426/4602/files/what_is_simulation_distance_in_minecraft.pdf
    • https://cdn.shopify.com/s/files/1/0431/1603/6262/files/62257089022.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/37638787324.pdf
    • https://cdn.shopify.com/s/files/1/0428/5733/2895/files/92436716912.pdf
    • https://cdn.shopify.com/s/files/1/0440/5755/9190/files/44401084076.pdf
    • https://cdn.shopify.com/s/files/1/0433/7106/9594/files/93075952838.pdf
    • https://cdn.shopify.com/s/files/1/0427/7328/2983/files/pivabafunaliretudapon.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/58491741341.pdf
    • https://cdn.shopify.com/s/files/1/0434/3493/4429/files/wovif.pdf
    • https://cdn.shopify.com/s/files/1/0434/5154/7800/files/tejiwulabi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000061f2.bin
d98eee2f24db9d89a3adcc90efbafe2bfe0419c11f963adb5d8bab7da0736e4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61F2 5420 bytes
font_01_sfnt_off0000742c.bin
01000d144896aeaf94a1b7427ba756f54ef43f956e72fa5c44691998a1bc164a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x742C 9920 bytes
font_02_sfnt_off0000961f.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x961F 4324 bytes

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