Malicious PDF — malware analysis report

Static analysis result for SHA-256 f65a0817aef5cc83…

MALICIOUS

PDF

66.1 KB Created: 2020-08-07 04:24:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e7e50ae5e9c5b9769de6daf5ab913ae3 SHA-1: 438cf0e0ed1c453d7e6512829c95465fd0206e59 SHA-256: f65a0817aef5cc834fac68d7747323bbb878fd9ffcb792725554e55060dd29dd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a high density of external links, many of which point to a redirector service. The primary malicious link, https://ttraff.cc/pify?keyword=addressing+modes+of+8086+microprocessor+pdf, is designed to obscure the final destination. The ML classifier strongly indicated maliciousness, and the PDF structure itself is indicative of a link farm used for SEO poisoning or phishing.

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/pify?keyword=addressing+modes+of+8086+microprocessor+pdf
    • http://files.professorsilverblank.com/uploads/1/3/0/8/130814078/bc31c52f8b.pdf
    • http://files.artsmartmanila.com/uploads/1/3/1/8/131856041/9477478.pdf
    • http://files.andygibsontv.com/uploads/1/3/0/8/130873855/sijosu.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/84731461588.pdf
    • https://cdn.shopify.com/s/files/1/0431/1813/3405/files/56180436498.pdf
    • https://cdn.shopify.com/s/files/1/0432/0333/0208/files/gotipiruxiwebotonixa.pdf
    • https://cdn.shopify.com/s/files/1/0438/6629/2389/files/45317255872.pdf
    • https://cdn.shopify.com/s/files/1/0435/6482/6783/files/96819854905.pdf
    • https://cdn.shopify.com/s/files/1/0430/9073/9361/files/22704405051.pdf
    • https://cdn.shopify.com/s/files/1/0431/9431/9009/files/cardiac_sternal_precautions.pdf
    • https://cdn.shopify.com/s/files/1/0433/3276/3801/files/viwutosovuxifur.pdf
    • https://cdn.shopify.com/s/files/1/0428/4570/0262/files/baseball_card_price_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/75972668210.pdf
    • https://cdn.shopify.com/s/files/1/0433/5573/4167/files/carboprost_tromethamine_davis.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31052941417.pdf
    • https://cdn.shopify.com/s/files/1/0429/8034/3967/files/beginner_rhythm_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0439/0649/8728/files/lulonefopodaruworusap.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b5e2.bin
556034fd71f6f4211bec903fe27e2c978479ed42a64797e607bea54899e989f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5E2 5420 bytes
font_01_sfnt_off0000c82e.bin
7f1c50e26b2dbb44fabec89e4e648c6358be242869615d4aa96aee5d5aac897c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC82E 10632 bytes
font_02_sfnt_off0000ec7c.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7C 4324 bytes

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