Malicious PDF — malware analysis report

Static analysis result for SHA-256 1341e91918da84fb…

MALICIOUS

PDF

58.3 KB Created: 2020-08-14 06:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb9dc7fec47ef95636673e0ec163dc65 SHA-1: c4caa362a5f9e361a593d2f81a50b30bbc80314d SHA-256: 1341e91918da84fb1fac436449f12d47b175bb2c9b7bc95c315c947127544ecd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links, one of which points to a known malicious redirector (ttraff.com). The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, also contains the same malicious URL, suggesting an attempt to lure users to harmful content.

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=amrita+nayak+all+video+songs
    • http://misedana.renewswindon.org.uk/uploads/1/3/2/7/132740405/0fe0810f1.pdf
    • http://files.seviersdinternships.org/uploads/1/3/0/7/130775701/benabolib.pdf
    • http://files.grantcountyinfair.com/uploads/1/3/0/7/130740464/siwofefojogudes.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/9442/3192/files/74733875225.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/1334458490.pdf
    • https://cdn.shopify.com/s/files/1/0429/4619/9711/files/punch_out_rom.pdf
    • https://cdn.shopify.com/s/files/1/0431/5021/3274/files/figure_drawing_for_fashion_design_book.pdf
    • https://cdn.shopify.com/s/files/1/0435/6400/7583/files/60114363317.pdf
    • https://cdn.shopify.com/s/files/1/0434/6678/4932/files/tarzan_car_full_movie_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0430/6544/2455/files/18148432172.pdf
    • https://cdn.shopify.com/s/files/1/0437/5488/1175/files/conformational_analysis_of_cycloalkanes.pdf
    • https://cdn.shopify.com/s/files/1/0428/7807/5036/files/nizitipofot.pdf
    • https://cdn.shopify.com/s/files/1/0435/5594/6647/files/bojolixowukovigo.pdf
    • https://cdn.shopify.com/s/files/1/0437/1592/0024/files/mazevogowutoja.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008542.bin
777e92bde9bb3914294de1268f586830b123d975ee2a960e649c47861acb7721		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8542 5360 bytes
font_01_sfnt_off0000976f.bin
5d7137bc31ca2d54ca9e64518c0867e2ff8989ca95386422389b6e7f7c2f7ef0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x976F 15204 bytes
font_02_sfnt_off0000c6bc.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6BC 16204 bytes

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