Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1ee2113f7097b0d…

MALICIOUS

PDF

41.4 KB Created: 2020-08-08 16:07:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed9718aadde4b5be4c18147ba982bf76 SHA-1: 5878c07eb572fa3f5ee8265bef9b017fcf7fc664 SHA-256: f1ee2113f7097b0dec4eebd9568495a2ce53b41ef41f0f275710205f74ea53d0
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.com/pify?keyword=variable+frequency+drive+tutorial+pdf', is flagged as a known malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to lure users to malicious infrastructure. The ML classifier strongly supports the malicious verdict.

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=variable+frequency+drive+tutorial+pdf
    • http://fepum.kylespestsolution.com/uploads/1/3/0/9/130969204/gopoberafijafebupi.pdf
    • http://files.kathrynluster.net/uploads/1/3/0/9/130969003/runoworu.pdf
    • http://files.opunakesurflifesaving.com/uploads/1/3/0/8/130814513/gezitowejukejekojuko.pdf
    • http://files.northwesternbreastsurgeons.com/uploads/1/3/1/6/131606025/pafojidivif.pdf
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/pitutel.pdf
    • https://cdn.shopify.com/s/files/1/0428/5523/5740/files/kindle_stuck_in_usb_drive_mode.pdf
    • https://cdn.shopify.com/s/files/1/0427/9985/7823/files/26986851600.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/94828894711.pdf
    • https://cdn.shopify.com/s/files/1/0437/9099/1521/files/barron_s_ap_calculus_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/0015/1707/files/kagodexufexilizuxezozej.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/kejuferak.pdf
    • https://cdn.shopify.com/s/files/1/0432/5395/6758/files/types_of_inorganic_fertilizer.pdf
    • https://cdn.shopify.com/s/files/1/0432/9422/8630/files/zefugilolinukekaf.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/92484408067.pdf
    • https://cdn.shopify.com/s/files/1/0435/9602/1919/files/nenagulog.pdf
    • https://cdn.shopify.com/s/files/1/0429/0917/1871/files/78002149089.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_off000064b7.bin
5c977be683d8f0c0bb3cb524987dfc785215f7f68005dd50e79dabaa1f9a1e1a
pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 5364 bytes
font_01_sfnt_off0000770b.bin
70f2ac87418b81aef7032e032c08e3a450891e171ab17fc21b88fb0c1bdbe2c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x770B 9856 bytes