Malicious PDF — malware analysis report

Static analysis result for SHA-256 a859a9c3aba2c762…

MALICIOUS

PDF

42.9 KB Created: 2020-09-01 05:05:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec95501fe8a5480e5cad86f89e9a72aa SHA-1: ef4b359df00d91839b51ac420de45781d01f1ee2 SHA-256: a859a9c3aba2c762175e5084ca3c6cdfdbec56318564d0c49479f2ef35a8199b
154 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.cc, which is disguised as a link for 'apa guidelines footnotes'. This suggests a phishing or scam attempt. The PDF also contains a large number of external links, many hosted on Shopify, which is characteristic of SEO link farm abuse to obscure malicious destinations. No scripts were extracted, but the presence of the malicious redirector and the link farm technique strongly indicate a malicious intent to redirect users to harmful content.

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/wix?keyword=apa+guidelines+footnotes
    • https://cdn.shopify.com/s/files/1/0427/6197/8023/files/aprender_a_dibujar_paso_a_paso.pdf
    • https://cdn.shopify.com/s/files/1/0433/3037/1738/files/ejercicios_de_traslaciones_rotaciones_y_reflexiones.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/cuentos_en_ingles_nivel_basico.pdf
    • https://cdn.shopify.com/s/files/1/0430/1501/2511/files/wudomujijipinim.pdf
    • https://cdn.shopify.com/s/files/1/0430/2379/4337/files/84538117019.pdf
    • https://cdn.shopify.com/s/files/1/0436/6788/2134/files/kevudekefigisofososeseto.pdf
    • https://cdn.shopify.com/s/files/1/0432/0408/3869/files/algorithmen_und_datenstrukturen_fr_dummies.pdf
    • https://cdn.shopify.com/s/files/1/0437/9095/8749/files/minemifepik.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/post_office_charles_bukowski_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0453/4692/files/77268803517.pdf
    • https://static.usrfiles.com/ugd/856cea_4b3b1573b7d248a5819bce7a542300ec.pdf
    • https://static.usrfiles.com/ugd/b8c837_611ab0e9ed0f4056b6505d083582c493.pdf
    • https://static.usrfiles.com/ugd/a91264_f1a7e93e0faa45b2aa8ad6096c1bea7f.pdf
    • https://cdn.shopify.com/s/files/1/0432/4166/8770/files/denowipifunasimu.pdf
    • https://cdn.shopify.com/s/files/1/0457/3747/6252/files/manual_bank_reconciliation_process_i.pdf
    • https://cdn.shopify.com/s/files/1/0434/1497/8718/files/34758352485.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_off00006a8c.bin
540197f8c8cb5a5831af7725c4ea17fe6078a2083fda04a65fc12818d7235457		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A8C 5100 bytes
font_01_sfnt_off00007c01.bin
04f4b4fbf707415046bfc3e1dc200aec9133db9632c7517c0717991108683dde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C01 10256 bytes

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