Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83290f0aa1e57c7…

MALICIOUS

PDF

46.8 KB Created: 2020-08-09 22:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc34f172ec8c94c1bce0c2d5ab4d2b5c SHA-1: 6f28cdf81c1aca80622373f56f9581a584db5c95 SHA-256: d83290f0aa1e57c75c6cbb9df58fae1f2cb16893545def71de0ac2f0eeb45c99
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external resources, with one specifically identified as a malicious redirector. The document body text, while obfuscated, includes the phrase 'Libros de auditoria administrativa 2 pdf' and a URL that matches the malicious redirector, suggesting a lure to a phishing or malware distribution site. The ML classifier also strongly indicated maliciousness.

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.ru/pify?keyword=libros+de+auditoria+administrativa+2+pdf
    • http://files.flagstaffpottersguild.com/uploads/1/3/1/4/131453401/dodowarojuvegu.pdf
    • http://damexu.corehomeinspect.com/uploads/1/3/1/6/131606490/8ee46.pdf
    • http://files.miortuk-alaskan-husky-kennel.com/uploads/1/3/1/0/131070476/sepid.pdf
    • http://genesej.cruisesceptic.com/uploads/1/3/0/9/130969368/8848117.pdf
    • http://files.zo-axus.com/uploads/1/3/1/6/131606362/zofaxinav.pdf
    • https://cdn.shopify.com/s/files/1/0430/7314/2933/files/discord_change_profile_picture.pdf
    • https://cdn.shopify.com/s/files/1/0440/1538/6789/files/machine_gun_kelly_bad_things_mp3_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/4630/4920/files/zadugubewugasikewupeloze.pdf
    • https://cdn.shopify.com/s/files/1/0429/1559/4393/files/pokefopesokugubori.pdf
    • https://cdn.shopify.com/s/files/1/0437/2280/1306/files/cg_police_caf_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/wabekujoromowisumixij.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/vebupunepomupu.pdf
    • https://cdn.shopify.com/s/files/1/0436/9448/9755/files/kotikegovofatefelefabe.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/21021717149.pdf
    • https://cdn.shopify.com/s/files/1/0431/7023/4527/files/52905050213.pdf
    • https://cdn.shopify.com/s/files/1/0430/6855/5415/files/wewonupex.pdf
    • https://cdn.shopify.com/s/files/1/0431/8851/9080/files/rufilafutazadobabikawuvat.pdf
    • https://cdn.shopify.com/s/files/1/0432/6385/2712/files/rinivega.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/50306279194.pdf
    • https://cdn.shopify.com/s/files/1/0432/2135/2606/files/ribufebuvo.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/
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5030627919

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006aa7.bin
24548e8559df647a16fdbe0563ad5bc28a2d8ebb0593af5b0885fca9f14bc6da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6AA7 5308 bytes
font_01_sfnt_off00007c98.bin
35daf6be335201ab055078f382a00dd146ec64ecc7111fb3e166cc7017c28345		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C98 10332 bytes
font_02_sfnt_off00009e06.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E06 4324 bytes

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