Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd54c3750057a81…

MALICIOUS

PDF

39.4 KB Created: 2020-08-17 07:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da4df6db1902e839ef1a595ef20ee474 SHA-1: d018846d1c9b162422d25990c0b1ec6746171d95 SHA-256: efd54c3750057a815a2a986cb321b4fa454c627207d100c5b38d8898d585a8af
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which are hosted on seemingly unrelated domains and point to PDF files. One critical heuristic identified a link to a known malicious redirector, and another flagged the document as a link farm. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, includes the URL "https://ttraff.ru/pify?keyword=best+c+v+format+in+pakistan", suggesting a lure to a malicious site disguised as a CV format resource.

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.ru/pify?keyword=best+c+v+format+in+pakistan
    • http://vadataxon.veeartsy.com/uploads/1/3/0/8/130814328/mikawojemipine.pdf
    • http://files.iantheresaswonderfullife.com/uploads/1/3/1/6/131637224/nakur-jelosuwonen-sorewa.pdf
    • http://files.feedmeupdelivery.com/uploads/1/3/2/6/132682565/3128317.pdf
    • http://jiwifas.sinaiwright.com/uploads/1/3/0/8/130814328/dowizetofuzekexezum.pdf
    • http://files.dakotayouthandyoungadults.org/uploads/1/3/0/7/130739746/xubogujalu.pdf
    • https://cdn.shopify.com/s/files/1/0429/6150/2374/files/nojixuxes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5276/0224/files/neuron_and_neuroglia_worksheet_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3585/files/kodakosowonerad.pdf
    • https://cdn.shopify.com/s/files/1/0431/7482/2043/files/swedish_adjectives_list.pdf
    • https://cdn.shopify.com/s/files/1/0437/4410/0506/files/kegazidajogin.pdf
    • https://cdn.shopify.com/s/files/1/0434/5865/8469/files/wotifiligejilomevag.pdf
    • https://cdn.shopify.com/s/files/1/0431/8691/3442/files/degibedujebejuzoremenoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/41682585858.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/11085861466.pdf
    • https://cdn.shopify.com/s/files/1/0434/1003/0748/files/33549075451.pdf
    • https://cdn.shopify.com/s/files/1/0432/7030/7995/files/compress_mac_automator.pdf
    • https://cdn.shopify.com/s/files/1/0429/0406/0071/files/tarojijoduxaxunaki.pdf
    • https://cdn.shopify.com/s/files/1/0427/8131/1132/files/gutam.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_off00005d6c.bin
f9bf2a4c08b227cc0d391a83b6a721c4c9299eaa404c505b888cca93e5bc3134		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6C 5300 bytes
font_01_sfnt_off00006f65.bin
71364c7678f50e3feefcba8d9858804532f25af06ca75083481ff098e15f9fc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F65 9780 bytes

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