Malicious PDF — malware analysis report

Static analysis result for SHA-256 015273a86e2c0e33…

MALICIOUS

PDF

41.5 KB Created: 2020-08-17 05:48:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4a8d91550ee777640f1723610739a93 SHA-1: c3ef912fe78f926ef7fceb8ba71d9aa3b0940cc3 SHA-256: 015273a86e2c0e337b45928d676f8fa3293c55c3815ef885082681c071a2462d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF document contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for "Adventure games for android top 10". The PDF_SEO_LINK_FARM heuristic suggests the document is part of a larger link farm operation, likely to improve search engine rankings for malicious content. The ML_NYX_PDF_MALICIOUS classifier strongly supports the malicious nature of this PDF.

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=adventure+games+for+android+top+10
    • http://teriwa.fitnessbeyondbelief.com/uploads/1/3/0/7/130775982/bajebovumubivipuzim.pdf
    • http://tefaxida.selflovedetox.com/uploads/1/3/0/8/130874601/5290412.pdf
    • http://files.mofflongboards.com/uploads/1/3/0/7/130776858/xafamezoxosimiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/3491/0618/files/33949904069.pdf
    • https://cdn.shopify.com/s/files/1/0430/1655/2605/files/56516026450.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/kijemukevoniwamevizinoge.pdf
    • https://cdn.shopify.com/s/files/1/0438/7930/1275/files/cbse_class_12_sample_paper_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/6836399540.pdf
    • https://cdn.shopify.com/s/files/1/0429/4085/8527/files/pafumosojax.pdf
    • https://cdn.shopify.com/s/files/1/0434/3254/2369/files/fugifubes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8861538602.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/bapowakoramunobonudipiri.pdf
    • https://cdn.shopify.com/s/files/1/0433/6985/7176/files/kubujapapekawatat.pdf
    • https://cdn.shopify.com/s/files/1/0434/8300/5093/files/44028578538.pdf
    • https://cdn.shopify.com/s/files/1/0433/9390/8892/files/does_uwu_mean_cute.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_off00006361.bin
f77d5c1392c0514e0661a9fb220861e37b1a6686bb7d2592bae9be7277ed8260		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6361 5572 bytes
font_01_sfnt_off00007647.bin
ec5c4a6f2dc45a471c3caec653a4a74a44db8e18167f06d8f04c5cb31bbb6df8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7647 10196 bytes

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