Malicious PDF — malware analysis report

Static analysis result for SHA-256 5abcf7b0f55c2f75…

MALICIOUS

PDF

46.3 KB Created: 2020-08-13 22:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a00fdd2a26ce30da211e589272637e04 SHA-1: 365c8f7212d7d319ceaa305185d0a6941f555caa SHA-256: 5abcf7b0f55c2f75c7f7dd3a01568f22152783e39a80445395bacdb868bdcc94
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external websites, including a known malicious redirector. The document body and metadata suggest a lure to disguise the malicious intent. 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.com/pify?keyword=spanish+verb+conjugation+cheat+sheet+pdf
    • http://dusud.teatroflorcandela.org/uploads/1/3/0/9/130969204/8856.pdf
    • http://files.schulemengestorf.ch/uploads/1/3/0/7/130738821/1131545.pdf
    • http://sutuxatap.bickleyandcompany.com/uploads/1/3/0/7/130775607/vasalivinuv.pdf
    • http://gobil.moogully.com.au/uploads/1/3/0/8/130814297/xaxobapabudu-kisabubenum-limejizame-durezebiko.pdf
    • http://files.stepnout.com/uploads/1/3/1/3/131383964/6707282.pdf
    • https://cheatography.com
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/5564/4823/files/xurukejijudenebasa.pdf
    • https://cdn.shopify.com/s/files/1/0435/5332/5219/files/understanding_pathophysiology_6th_edition_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/25010998290.pdf
    • https://cdn.shopify.com/s/files/1/0435/7757/3535/files/rozakesozebedoporopeduf.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/58863311498.pdf
    • https://cdn.shopify.com/s/files/1/0432/0637/7633/files/38228619908.pdf
    • https://cdn.shopify.com/s/files/1/0432/8603/6635/files/antalya_bus_map.pdf
    • https://cdn.shopify.com/s/files/1/0428/7512/5923/files/buxalulizevudok.pdf
    • https://cdn.shopify.com/s/files/1/0429/3401/0015/files/fixture_liga_aguila_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/7987/6252/files/xumupuxev.pdf
    • https://cdn.shopify.com/s/files/1/0431/9769/4109/files/beps_action_4_final_report.pdf
    • https://cdn.shopify.com/s/files/1/0433/2837/2886/files/pink_ping_pong_balls_joke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0433/9220/4950/files/2436923830.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d48.bin
f4a27c7454cce99a6576c317f0491919b9e657dedb0bd450ffb1659da7fbe9cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D48 5644 bytes
font_01_sfnt_off0000706a.bin
000860f629ec19c9bc71a21f61ac72d4021a141a126a476ac196d8824b75a308		 pdf-font-stream PDF embedded font (sfnt) at offset 0x706A 14656 bytes
font_02_sfnt_off00009dc8.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DC8 4324 bytes

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