Malicious PDF — malware analysis report

Static analysis result for SHA-256 1783744c8c4995e9…

MALICIOUS

PDF

43.6 KB Created: 2020-08-17 16:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61e1e620baf89576f4bde4599d473a14 SHA-1: dec19a2255018c43f96d01ded9de71b3fd51e220 SHA-256: 1783744c8c4995e98ccd63e1272cf0e145741c1bbe0854eaf088aff15c44580d
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a malicious redirector link disguised as a download for 'Angry birds space pc free'. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and the presence of numerous embedded URLs, many pointing to Shopify, suggest a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the document body and embedded URLs point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=angry+birds+space+pc+free
    • http://files.germane2germaine.com/uploads/1/3/1/4/131452735/mutigonufegojas_bexozewozik.pdf
    • http://files.churchholyspirit.org/uploads/1/3/1/6/131606815/wejoxupowe_tisusuz_faredakotiwose.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9072/3487/files/vilidizawikemeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/6213/2897/files/32701045056.pdf
    • https://cdn.shopify.com/s/files/1/0431/7767/2868/files/14984823471.pdf
    • https://cdn.shopify.com/s/files/1/0447/3012/2393/files/group_counselling_definition.pdf
    • https://cdn.shopify.com/s/files/1/0435/1862/3896/files/95088985315.pdf
    • https://cdn.shopify.com/s/files/1/0434/6429/4557/files/35296413186.pdf
    • https://cdn.shopify.com/s/files/1/0434/5757/7122/files/59679893810.pdf
    • https://cdn.shopify.com/s/files/1/0433/4731/2789/files/aptitude_shortcut_tricks_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/3859/7539/files/denatesulevudexijatudike.pdf
    • https://cdn.shopify.com/s/files/1/0438/0311/5680/files/munchkin_boilers_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0437/7850/6904/files/gejedatezobigolis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9296/7581/files/neither_nor_either_or.pdf
    • https://cdn.shopify.com/s/files/1/0454/2785/1422/files/6205846389.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ae5.bin
2dad91f00a287ce018f537d3d57e2fa7317eb781ee9c1d1c67829fd79ec0ea9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AE5 5524 bytes
font_01_sfnt_off00007db3.bin
7fee554ace43fca732a59ce182c2eecb1488d8aa2dbb2119cfe3907f91e5c797		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DB3 10640 bytes

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