Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a2cc5723d932a9…

MALICIOUS

PDF

52.3 KB Created: 2020-08-16 20:59:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e705d29466666d350ef3751e2d8dfdd9 SHA-1: 39b2560b0a9891fa9295bd6b29c844854bb3ae15 SHA-256: 43a2cc5723d932a93a91b3a1b27f45d1b3a3c3d34f23fad70fcbea2272124730
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a report. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK indicates that the embedded URL leads to known malicious infrastructure. Additionally, the PDF_SEO_LINK_FARM heuristic suggests a large number of outbound links, many hosted on cdn.shopify.com, which are likely part of a link farm to improve search engine ranking for malicious content. 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=properties+of+fresh+and+hardened+concrete+report
    • http://files.world-with-elegance.com/uploads/1/3/1/3/131383283/kifidozuted.pdf
    • http://files.1stgenoffroad.com/uploads/1/3/1/6/131606291/862d671703.pdf
    • http://files.sylvianemoss.co.uk/uploads/1/3/1/4/131483281/jutezazivemajiv.pdf
    • http://files.dennisdotywebsite.com/uploads/1/3/0/7/130738799/xomok.pdf
    • http://files.liveoakkids.org/uploads/1/3/0/7/130739363/detegawado-jarigikod.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/masetunoxip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4886/9789/files/pdf_and_cdf_in_probability.pdf
    • https://cdn.shopify.com/s/files/1/0429/7244/6873/files/14308699440.pdf
    • https://cdn.shopify.com/s/files/1/0430/5004/1495/files/vugekudokotabizasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0434/2772/5474/files/belong_to_you_vi_keeland_espaol.pdf
    • https://cdn.shopify.com/s/files/1/0429/8365/3527/files/44591669461.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/critical_theory_books.pdf
    • https://cdn.shopify.com/s/files/1/0429/8627/4977/files/nopokepotewetarumijixozoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/mitemi.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/sizafokadulasenam.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_off00008e91.bin
7965ab083a2d19784ce061dccbe99bc1af142a554547f8d4c1dc8b4aaa41eb00
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E91 5212 bytes
font_01_sfnt_off0000a03c.bin
414588c884611bb1efa42074d10972456ab683cad1ca0ab94b7a11f954061da1
pdf-font-stream PDF embedded font (sfnt) at offset 0xA03C 10492 bytes