Malicious PDF — malware analysis report

Static analysis result for SHA-256 27efd34ae504e523…

MALICIOUS

PDF

50.7 KB Created: 2020-08-07 08:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0ea2088e14b8b3670d45262b5a3aeeff SHA-1: 38edb280410e8f9681337e96e69c2e8420a2228c SHA-256: 27efd34ae504e523fa58355900d603915d24222cb206fd7815fb862a785c2571
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a mass of external links, including a critical redirector link to 'ttraff.com'. The document body, though obfuscated, contains the same URL, suggesting a lure to a malicious site. The ML classifier strongly supports the malicious verdict. No scripts were extracted, but the PDF structure and embedded links are sufficient to indicate a malicious redirection attempt.

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=yield+strength+of+mild+steel+pdf
    • http://files.fairytalejourneysbybrett.com/uploads/1/3/0/7/130738564/494d1f2f1400e.pdf
    • http://files.nicholasruscettaart.com/uploads/1/3/1/0/131070476/1458212e6e.pdf
    • http://nutofiboz.threefeatherscreations.com/uploads/1/3/0/7/130740596/9126496.pdf
    • http://files.soulshineslc.com/uploads/1/3/0/7/130775032/4257115.pdf
    • http://files.jacquelinesdancestudio.com/uploads/1/3/1/3/131397946/pezulaguban-wuzabenuv-gixiterekevene-padifepeb.pdf
    • https://cdn.shopify.com/s/files/1/0437/8145/6023/files/58055278256.pdf
    • https://cdn.shopify.com/s/files/1/0434/3624/5144/files/29660354730.pdf
    • https://cdn.shopify.com/s/files/1/0436/7230/5817/files/xoxefowoditonogu.pdf
    • https://cdn.shopify.com/s/files/1/0438/2159/6834/files/color_blindness_test_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/8434/8569/files/1326039562.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/33329911116.pdf
    • https://cdn.shopify.com/s/files/1/0437/7473/8593/files/63255476084.pdf
    • https://cdn.shopify.com/s/files/1/0432/8849/4236/files/wovidirefalize.pdf
    • https://cdn.shopify.com/s/files/1/0428/2531/8563/files/22458571815.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42778697636.pdf
    • https://cdn.shopify.com/s/files/1/0432/9373/7110/files/47430847934.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12319118289.pdf
    • https://cdn.shopify.com/s/files/1/0434/4994/2176/files/tasawilawonapusokit.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_off00007d93.bin
ab088fb43ac16461f5b4e794f3f3d4780bf55a454177dcbe9d150b00fb814359		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D93 5204 bytes
font_01_sfnt_off00008f22.bin
6a9d6fbd465476e45aa7c7c29ec0380af5e09d7f91c9672aa6e67a401efec662		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F22 14896 bytes

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