Malicious PDF — malware analysis report

Static analysis result for SHA-256 855cf05380856af7…

MALICIOUS

PDF

48.2 KB Created: 2020-08-07 10:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b085234d571d90212dd8643da01f9d40 SHA-1: 20d041b38e44bbbad99be7ab92ef97dd36eaf743 SHA-256: 855cf05380856af74ede3b7f6210a3449948f55ba6185b919707c6e382817ced
154 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of embedded URLs, many of which point to external PDF files hosted on various domains. One URL, 'https://ttraff.com/pify?keyword=reunion+de+alma+ata+1978+pdf', is flagged as a known malicious redirector. The presence of numerous links suggests a link farm or SEO manipulation tactic, potentially leading to malicious content or phishing pages. No scripts were extracted, but the ML classifier strongly indicates 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/pify?keyword=reunion+de+alma+ata+1978+pdf
    • http://files.trailsuntraveled.com/uploads/1/3/1/4/131408100/2bab06ec6c3960.pdf
    • http://files.lucidletters.com/uploads/1/3/0/8/130874612/3252687.pdf
    • http://nuxev.scarletvalleylogistics.com/uploads/1/3/1/3/131379803/b2fb56ce18.pdf
    • http://files.seeandbekitchen.com/uploads/1/3/1/4/131407965/ruduletoxivi_binedoxoze_lebapur_genamamobakotuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/senamewo.pdf
    • https://cdn.shopify.com/s/files/1/0432/8184/2341/files/ruwanupivaridamimunupese.pdf
    • https://cdn.shopify.com/s/files/1/0440/8426/5110/files/sajorexepatobixakadomege.pdf
    • https://cdn.shopify.com/s/files/1/0437/0163/3177/files/39701306822.pdf
    • https://cdn.shopify.com/s/files/1/0438/3378/6525/files/zolononiwemuzu.pdf
    • https://cdn.shopify.com/s/files/1/0437/7280/5277/files/13577432997.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pegegezanonipilupe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6550/8002/files/mawefakabawotetep.pdf
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/difitoxux.pdf
    • https://cdn.shopify.com/s/files/1/0438/1225/7952/files/pazuwugopulokomidiraf.pdf
    • https://cdn.shopify.com/s/files/1/0437/9839/7085/files/wumonaxokukoputataxubepol.pdf
    • https://cdn.shopify.com/s/files/1/0432/2027/1259/files/66654830909.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4235/files/kutegewabukuzivax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/luzejajegaxidalide.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_off00007ef8.bin
3facfa32471b237d5bedadf611e0e6e808e9a315e9ade5e9887a85364e57da06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF8 5404 bytes
font_01_sfnt_off0000915d.bin
cdabd835e890e9bfc04aed5bf56be4ec9eed5e0b23d82b9e319348b856aba0ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x915D 10112 bytes

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