Malicious PDF — malware analysis report

Static analysis result for SHA-256 62a146c3c785c109…

MALICIOUS

PDF

51.1 KB Created: 2020-08-04 23:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9f350e9ba76183eb573a0cacfc17f140 SHA-1: fb06f467a9c442eb259ef0b40a878d59e4e70c5b SHA-256: 62a146c3c785c109d8aae5cdd40eb5bfb3eb898385d7ce2e06653ab2c5734aca
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated but contains the malicious URL and numerous benign-looking Shopify links, suggesting a link farm or SEO poisoning attempt to lure users to malicious sites.

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=tds+category+list+pdf
    • http://files.makealltimetreasures.org/uploads/1/3/1/3/131384300/jovazuzupi-vejexatove-doduvozavopajon.pdf
    • http://files.ieselpicarral.com/uploads/1/3/1/4/131454102/roteba.pdf
    • http://files.sweetwaterlax.com/uploads/1/3/0/8/130874125/4019235.pdf
    • http://files.nniggeleportfolio.com/uploads/1/3/1/3/131384559/bf425cf6d17fe66.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/7818/0257/files/wanajopamasezuxoremozidim.pdf
    • https://cdn.shopify.com/s/files/1/0430/8251/4581/files/classroom_of_the_elite_volume_5.pdf
    • https://cdn.shopify.com/s/files/1/0435/6079/6318/files/foruxijaj.pdf
    • https://cdn.shopify.com/s/files/1/0434/9958/5696/files/bostan_saadi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3524/7271/files/16069216880.pdf
    • https://cdn.shopify.com/s/files/1/0428/0333/1231/files/gavijulebikofafolixav.pdf
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/49379450091.pdf
    • https://cdn.shopify.com/s/files/1/0439/8628/8798/files/credit_card_authorization_form_template.pdf
    • https://cdn.shopify.com/s/files/1/0430/6383/6834/files/silusurenesinedugojuzom.pdf
    • https://cdn.shopify.com/s/files/1/0433/2794/6904/files/wanidiwa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0202/files/62811293745.pdf
    • https://cdn.shopify.com/s/files/1/0428/2561/3475/files/74674571543.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_off0000802c.bin
ebe2efe867014001b7db929347c32d965744135401855769477fd1c065bb7773
pdf-font-stream PDF embedded font (sfnt) at offset 0x802C 5376 bytes
font_01_sfnt_off0000928f.bin
4081947354e778dd9b9eb1cbf05f5a92eb7838428d99d8d7f37c6ad051f5c8c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x928F 14464 bytes