Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6b2edec77021c3…

MALICIOUS

PDF

32.5 KB Created: 2020-08-24 21:28:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ce3428c248e047b37aeec47df97e3bb SHA-1: 74bad831c2dfe5d05cceecf456e7427afa999ea8 SHA-256: 4f6b2edec77021c389b1cac7714c8d828edc7b1f48c3efa72d514ac0a07da19a
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to PDF files hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=surah+naba+video', is identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious with high confidence. The presence of a link farm and a malicious redirector suggests an attempt to lure users to malicious 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.cc/pify?keyword=surah+naba+video
    • http://gukidepin.pixiepatchbda.com/uploads/1/3/1/8/131871721/gipupezav-zozamomig.pdf
    • https://cdn.shopify.com/s/files/1/0433/1290/6405/files/rilitudorekez.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/jepomubotetasoxu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/59840398827.pdf
    • https://cdn.shopify.com/s/files/1/0435/3517/1738/files/pisojuzixo.pdf
    • https://cdn.shopify.com/s/files/1/0437/7909/6728/files/adulttubo_italiano_xxx_vod_17_cover.pdf
    • https://cdn.shopify.com/s/files/1/0437/0232/1307/files/bsnl_landline_cancellation_letter_format.pdf
    • https://cdn.shopify.com/s/files/1/0437/3538/4225/files/biatain_soft_hold.pdf
    • https://cdn.shopify.com/s/files/1/0440/0329/5382/files/jobojidawimakowuduritu.pdf
    • https://cdn.shopify.com/s/files/1/0437/5861/6733/files/wazowe.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044a5.bin
d6be771f616ec4098327c503a17ac01501fd6acc4217fda0e99f9fccc356adb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44A5 5008 bytes
font_01_sfnt_off000055a3.bin
0fb1975ab8ab8261a833c89e23a723e994c1d0b36dab5d4183b3048abf52b44a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x55A3 9108 bytes

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