Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d13fff65cf3359…

MALICIOUS

PDF

67.4 KB Created: 2020-08-04 14:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2cbae8232db58bf32312656eb8e376ba SHA-1: 14237b3c88d1af8e732442837baa7492d2d8d2b3 SHA-256: 71d13fff65cf33594998263f2551097e423236a1ff7d09c1d5fcfb24a2d69956
154 Risk Score

Malware Insights

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

The PDF document contains a link farm and a redirector link pointing to malicious infrastructure, suggesting a phishing or scam attempt. The document body, though heavily obfuscated, contains a URL that appears to be a lure for academic books, which is then redirected. The presence of numerous PDF links further supports the SEO spam and redirection attack pattern.

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=ignou+ba+public+administration+books+pdf
    • http://files.magictouchphotostudio.com/uploads/1/3/1/6/131606046/kilonuviben.pdf
    • http://files.olgamagasacupuncture.com/uploads/1/3/0/7/130776481/8980236.pdf
    • http://files.becuteimporium.com/uploads/1/3/0/7/130739202/bunulatovevipis-futoferabaron-fanudot-kodid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0434/1740/3559/files/worikag.pdf
    • https://cdn.shopify.com/s/files/1/0438/9847/0552/files/nenirulamalizerulowanugef.pdf
    • https://cdn.shopify.com/s/files/1/0427/4677/3660/files/51354966805.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/sevavexiboterukegof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/gitedubuzaruniwuxo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7995/7669/files/4771598485.pdf
    • https://cdn.shopify.com/s/files/1/0441/3269/6216/files/potamarojudisi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1701/files/gosatajiteforomizuzobese.pdf
    • https://cdn.shopify.com/s/files/1/0430/0436/2906/files/36053234850.pdf
    • https://cdn.shopify.com/s/files/1/0433/6487/6453/files/bigaxisixixaxuripik.pdf
    • https://cdn.shopify.com/s/files/1/0434/3519/6566/files/33586518274.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009a18.bin
de9122327b1352a5bf4ddde81074617e462951eacf2364a47661325ce61b3bff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A18 5380 bytes
font_01_sfnt_off0000ac3d.bin
70d5eaf5fb819ef414083282c9b6b0e65a16a2d5808200e913c5ac29c9d8f327		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3D 14612 bytes
font_02_sfnt_off0000d995.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD995 4324 bytes
font_03_sfnt_off0000e794.bin
e810a921a92b46728a83b1b54a3bccef63b3f7381984be84eb119a3e37896c98		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE794 7088 bytes

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