Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec19fcc56331f5a2…

MALICIOUS

PDF

43.9 KB Created: 2020-08-06 08:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1257dcc1cb069970468d0f5beb4371d3 SHA-1: 219858a3854d6fe0231283fd40c9f4763679abd5 SHA-256: ec19fcc56331f5a2b5205b6868d8a8829cb9284394c95eea88016ac277038c60
152 Risk Score

Malware Insights

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

The PDF file contains a lure related to educational materials, specifically 'maths worksheets for year 1 pdf'. It embeds a significant number of external links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. Crucially, one of the embedded URLs, 'https://ttraff.cc/pify?keyword=maths+worksheets+for+year+1+pdf', is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, limiting the analysis of direct payload execution.

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=maths+worksheets+for+year+1+pdf
    • http://sazokibil.mariamartinezordaz.com/uploads/1/3/2/6/132682883/38c757fe.pdf
    • http://files.gtecodev.com/uploads/1/3/2/6/132681611/fivetop-fugovufilej-kenosaj-ragopifotosis.pdf
    • http://xowisapu.uwpprofessorgeorge.com/uploads/1/3/1/4/131453060/515214.pdf
    • http://files.mosaconcerts.org/uploads/1/3/1/3/131380754/7771862.pdf
    • http://tovas.middletontheatre.org/uploads/1/3/1/6/131607062/kijag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5544/7201/files/organic_chemistry_2nd_edition_david_klein.pdf
    • https://cdn.shopify.com/s/files/1/0433/8325/9301/files/luzizadoremovami.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/crane_operator_test_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6166/files/32393556295.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/psp_racing_games.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8374/files/83045652486.pdf
    • https://cdn.shopify.com/s/files/1/0427/8432/5798/files/nutetom.pdf
    • https://cdn.shopify.com/s/files/1/0432/4907/4336/files/69752409883.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/majomoginuvomiposelipaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/6749/7880/files/boxiziworulire.pdf
    • https://cdn.shopify.com/s/files/1/0434/4106/2040/files/83831274165.pdf
    • https://cdn.shopify.com/s/files/1/0429/8450/5498/files/93588796672.pdf
    • https://cdn.shopify.com/s/files/1/0428/3678/7356/files/42956036870.pdf
    • https://cdn.shopify.com/s/files/1/0433/7087/2995/files/mizufijanawajufuv.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_off00006b78.bin
f9be70946bedb827f398a16af794ceee984356e1beaec44d54dda3bb7cfea7e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B78 5412 bytes
font_01_sfnt_off00007e07.bin
0624910ecc0a2be4c2e88209f08db213e02cdb78e294ca8043db24798b75419d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E07 10616 bytes

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