Malicious PDF — malware analysis report

Static analysis result for SHA-256 28135557f73ce010…

MALICIOUS

PDF

53.5 KB Created: 2020-08-12 09:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b6081c8684d5b11ff03535fa476dbdf SHA-1: 904b8878eb668e965c72c18cba4c7093162e9dce SHA-256: 28135557f73ce010e4360f21b8b78ce65a4a58e63f122cb7793662ce1656b930
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm for SEO poisoning. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is used to lure users with search terms like 'hp elitebook 8560p maintenance manual'. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same search term, reinforcing the lure. The primary attack pattern involves redirecting users to malicious sites.

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/wb?keyword=hp%20elitebook%208560p%20maintenance%20manual
    • http://files.amandabrett.net/uploads/1/3/1/4/131482864/5243918.pdf
    • http://files.mcnairy.com/uploads/1/3/1/4/131454373/tugogavekofawez_sekoke_damapu.pdf
    • http://files.leclairecre.com/uploads/1/3/1/4/131437941/9933a8d3.pdf
    • https://cdn.shopify.com/s/files/1/0432/1109/6221/files/2079690909.pdf
    • https://cdn.shopify.com/s/files/1/0431/0673/0144/files/kuvadorodufusenok.pdf
    • https://cdn.shopify.com/s/files/1/0434/0118/3397/files/employee_attendance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8748/5342/files/18224674924.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2362/files/watanunonuxomobeluvopa.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/jasuxagebe.pdf
    • https://cdn.shopify.com/s/files/1/0433/4210/2679/files/le_retrait_des_actes_administratifs_unilatraux.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mejamuzeditika.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3082/files/gipezotalewil.pdf
    • https://cdn.shopify.com/s/files/1/0431/3396/0341/files/25767008985.pdf
    • https://cdn.shopify.com/s/files/1/0434/1760/0152/files/58694370521.pdf
    • https://cdn.shopify.com/s/files/1/0431/2665/3079/files/2931169329.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/1334164548.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00006347.bin
d48245c73fe31178a46867cf809984e3af241edee2172d082b188eec6d68a0ac		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x6347 11740 bytes
font_01_sfnt_off000089a1.bin
897bfcb57ac3ef7f5283a63dad9d802cc28263a2c7f660db8fd17ca088a6afa8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89A1 5584 bytes
font_02_sfnt_off00009c88.bin
1a7fc7db0aae5f87c301b0f58a370e626488f6fc4cac151bc01f9fc94caee278		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C88 13684 bytes

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