Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8b1bb551c18db8c…

MALICIOUS

PDF

43.6 KB Created: 2020-08-05 05:02:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d6b46d008874582f622c626940c0df6d SHA-1: 74ceb195c93b2cc10647cfdca766b71b81cf6ae8 SHA-256: a8b1bb551c18db8cd643e39ebf97600ac6fae914bfcb1f1e7e1f0397ec9fc9fa
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector at `https://ttraff.cc/pify?keyword=the+cask+of+amontillado+annotations+pdf`. This suggests the document is designed to lead users to malicious content. The ML classifier strongly supports the malicious verdict.

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=the+cask+of+amontillado+annotations+pdf
    • http://files.booksaregems.org/uploads/1/3/1/3/131398125/8992597.pdf
    • http://files.aschaxel.com/uploads/1/3/1/3/131381021/sazarurupika_kilebo.pdf
    • http://files.dublinplace.us/uploads/1/3/1/4/131409090/7386997.pdf
    • http://files.candlecafe.com/uploads/1/3/1/4/131483154/doxirivixepe_mozagita_banirijamo.pdf
    • http://files.maidtoshineservices.net/uploads/1/3/1/4/131437268/29f33e.pdf
    • https://cdn.shopify.com/s/files/1/0435/6544/9365/files/64333040381.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/69637230306.pdf
    • https://cdn.shopify.com/s/files/1/0428/5405/6092/files/65138159540.pdf
    • https://cdn.shopify.com/s/files/1/0431/8330/8955/files/27145099210.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/numunabenigudipetex.pdf
    • https://cdn.shopify.com/s/files/1/0430/6753/9623/files/49417080373.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/48466687054.pdf
    • https://cdn.shopify.com/s/files/1/0434/4417/5013/files/80965151953.pdf
    • https://cdn.shopify.com/s/files/1/0431/7488/7590/files/visowobasuwozeteku.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/vopokabi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/64143080377.pdf
    • https://cdn.shopify.com/s/files/1/0430/6688/4250/files/rixubasulaxomepaje.pdf
    • https://cdn.shopify.com/s/files/1/0433/8548/7516/files/free_cocktail_recipes_book.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_off00006e0f.bin
f39450197512d010d319ce26e15a95c72c868ead3bedb2e387668f96c294feb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E0F 5312 bytes
font_01_sfnt_off00008001.bin
21e7b1b3026e87d04d427c38dfca386abb904699b223dee9007685c3e1d4001e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8001 9880 bytes

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