Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4985b996d47268…

MALICIOUS

PDF

40.3 KB Created: 2020-08-14 11:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8a74ac1e87934a82a14f1e487b599b0 SHA-1: d912b4b5401e05cfa18b8a7c25d30285c0ea068a SHA-256: 7c4985b996d47268ef93c528fc966f63b1e3c06b5f57d663333a21516ee056da
154 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many pointing to Shopify-hosted PDFs, and a primary link to a known malicious redirector. This indicates a link farm or redirection strategy likely intended to lead users to malicious content or phishing pages. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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/wb?keyword=sistem%20pendidikan%20vernakular%20pdf
    • http://zabit.darlenetsao.com/uploads/1/3/1/4/131483492/38d457888.pdf
    • http://files.exsanguinationsignet.com/uploads/1/3/2/7/132712483/bogululuvaxafogime.pdf
    • http://paziwen.hermosawebdesign.com/uploads/1/3/0/7/130776078/gopibinoberariba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/1650/0886/files/gezimizosijukomuvin.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4924/files/luxedamobovumo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9526/1348/files/70778597223.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vinupagudesezubinu.pdf
    • https://cdn.shopify.com/s/files/1/0428/8485/8022/files/rodexo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4209/4756/files/xaxasuvatosowowot.pdf
    • https://cdn.shopify.com/s/files/1/0441/3623/5160/files/developing_skills_for_the_toefl_ibt.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rirolor.pdf
    • https://cdn.shopify.com/s/files/1/0433/2729/1544/files/68854404465.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/39764440216.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/kartilya_of_the_katipunan.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/asterisk_voip_manual.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_off000060ed.bin
cbe28716fb272c1410fbb02a3620a44d6879002ed3adb39031731dad55560c39
pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 5416 bytes
font_01_sfnt_off00007341.bin
7bf42360936bc4391bab3d66bd476efc1974bab56fdb8d384268080670061a23
pdf-font-stream PDF embedded font (sfnt) at offset 0x7341 9716 bytes