Malicious PDF — malware analysis report

Static analysis result for SHA-256 381fd1ca63baad9c…

MALICIOUS

PDF

46.2 KB Created: 2020-08-07 23:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 114a3e9121c661ae891943fd79abf411 SHA-1: 608bc5d6ced80e2fc7837fb5987c81e046ee50fd SHA-256: 381fd1ca63baad9c5ae21893c35aa094434649245de425ce3f503a6cf78d9f69
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ttraff.cc/pify?keyword=64+bpsc+syllabus+2020+pdf`. This indicates the document's primary purpose is to lure users to a malicious site. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the embedded URLs and the nature of the redirector suggest a phishing or social engineering attack.

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=64+bpsc+syllabus+2020+pdf
    • http://mimus.bouncezoo.com/uploads/1/3/0/8/130874655/132c7.pdf
    • http://files.bionaturae.com/uploads/1/3/0/8/130813906/f4242d82882c.pdf
    • http://files.cpathleticboosterclub.org/uploads/1/3/0/9/130969403/nirexudori.pdf
    • http://sitatet.pflumpfunrentals.com/uploads/1/3/2/7/132740214/guzanakujul_dutuxiwujowen_bibumate.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/the_pickup_artist.pdf
    • https://cdn.shopify.com/s/files/1/0428/7594/5113/files/20089058834.pdf
    • https://cdn.shopify.com/s/files/1/0440/8098/8325/files/mri_anatomy_knee.pdf
    • https://cdn.shopify.com/s/files/1/0427/8406/3654/files/71545759518.pdf
    • https://cdn.shopify.com/s/files/1/0434/2156/5084/files/can_hurt_me_download_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/44758106853.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/23661112708.pdf
    • https://cdn.shopify.com/s/files/1/0431/6420/5216/files/8497966878.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6648/files/kevodasetijivukirudaritap.pdf
    • https://cdn.shopify.com/s/files/1/0430/6167/4133/files/5396867265.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/5821242303.pdf
    • https://cdn.shopify.com/s/files/1/0432/8279/2606/files/rowewo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4755/9067/files/ultimate_intrigue_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/96140660293.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_off0000695a.bin
48933baca40290d1299b14ce6052d084762b60aba7119556488cddd8b2992355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695A 5136 bytes
font_01_sfnt_off00007ad2.bin
4ea135f2c0207eeea267e0a151d4a7ef9527ef92c34f760996d603aa8721abc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AD2 10076 bytes
font_02_sfnt_off00009d44.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D44 4324 bytes

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