Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7433841dce28b88…

MALICIOUS

PDF

41.3 KB Created: 2020-08-01 23:55:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c08c57056ac1696fa9bf3f399693ace SHA-1: c274d7be43ba529881a25d02c22baf08363c4585 SHA-256: a7433841dce28b88f26000201f5e1896f6e1d10d59163269d51fca778a7304d6
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final malicious destination. The document also contains a large number of links to other PDFs hosted on Shopify, suggesting a link farm or SEO poisoning attempt to attract victims. The ML classifier strongly indicated maliciousness, and the overall structure points to a phishing or scam lure.

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.com/pify?keyword=nike+coaches+of+the+year+clinic
    • http://files.mistymacal.com/uploads/1/3/2/6/132681979/41d84f9.pdf
    • http://files.candidworldreport.com/uploads/1/3/1/3/131383657/9850949.pdf
    • http://files.sherconresort.net/uploads/1/3/1/4/131407977/548219.pdf
    • http://files.mytoepro.com.au/uploads/1/3/1/1/131163667/xuxojigorepenavosa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0017/6544/files/dokafejonazomezaku.pdf
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/75599825669.pdf
    • https://cdn.shopify.com/s/files/1/0439/3048/4904/files/frente_bizare_love_triangle.pdf
    • https://cdn.shopify.com/s/files/1/0432/3662/2498/files/23974042744.pdf
    • https://cdn.shopify.com/s/files/1/0431/3382/9277/files/guzenin.pdf
    • https://cdn.shopify.com/s/files/1/0432/4517/4939/files/48923452368.pdf
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/vekalakafaritew.pdf
    • https://cdn.shopify.com/s/files/1/0438/6072/1829/files/loxuxiniwududiwisugogu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9093/4949/files/vidaxilukuxamonubinabaraf.pdf
    • https://cdn.shopify.com/s/files/1/0428/5467/8687/files/94843685768.pdf
    • https://cdn.shopify.com/s/files/1/0432/3724/5086/files/bibapomegunesaweg.pdf
    • https://cdn.shopify.com/s/files/1/0438/7880/9755/files/volaneparatugeduginoniv.pdf
    • https://cdn.shopify.com/s/files/1/0431/0227/3703/files/96769511885.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/71684506552.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
font_00_sfnt_off000053c2.bin
8bd0d1122ba894b379bd5be4521517dd0f41c68db6d6bbb22f56d81b961e1d31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C2 4892 bytes
font_01_sfnt_off00006452.bin
bd4e66136dc72886a0b399a64fa354e6f51ac0e0c2a2f9cd12429fa98456b439		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6452 11064 bytes
font_02_sfnt_off00008a01.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A01 4324 bytes

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