Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b41b684baf866d2…

MALICIOUS

PDF

38.4 KB Created: 2020-08-09 01:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d7e89bde17ecb063de65acfb03bd36b SHA-1: 49c6ec8e17df7ce02a06a8f6b98b89ef7cbcbb14 SHA-256: 4b41b684baf866d2548432985f82b5e9224ba3971dc032ee93f2c6094d79fa13
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, it contains a large number of embedded links, many hosted on cdn.shopify.com, suggesting a link farm designed to obscure the true destination. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack pattern appears to be a redirection-based lure.

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=arang+kelapa+pdf
    • http://files.scupstateparalegals.org/uploads/1/3/0/7/130740517/581a5d.pdf
    • http://files.sacovalleygemandmineralclub.org/uploads/1/3/0/8/130814874/234499.pdf
    • http://files.greatcowbasic.com/uploads/1/3/1/8/131856907/bugobadewuderasebado.pdf
    • http://xifom.advertiseinflight.com/uploads/1/3/0/7/130739059/xetifoganol.pdf
    • http://files.nashobavalleyextractco.com/uploads/1/3/0/8/130874207/povexepu-guxisopive-xamifidixamu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/pizegavegip.pdf
    • https://cdn.shopify.com/s/files/1/0432/1666/6786/files/wipevuwisiziteji.pdf
    • https://cdn.shopify.com/s/files/1/0431/4795/2294/files/28935797185.pdf
    • https://cdn.shopify.com/s/files/1/0432/2122/1539/files/abraxas_deus_e_demonio.pdf
    • https://cdn.shopify.com/s/files/1/0433/0097/8853/files/19583827360.pdf
    • https://cdn.shopify.com/s/files/1/0440/2796/9686/files/87204437078.pdf
    • https://cdn.shopify.com/s/files/1/0429/8768/4003/files/59224906732.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/9544739541.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9020/files/tedikuvijojanexuwejiroro.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/80175739342.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/payment_of_gratuity_act_1972_bare_act.pdf
    • https://cdn.shopify.com/s/files/1/0429/9164/8929/files/29857290457.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/97697777452.pdf
    • https://cdn.shopify.com/s/files/1/0435/8340/6239/files/ackermann_steering_mechanism.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_off00005930.bin
a42a915c487634745818a99a59b1ca62071076c20e160f334fd8c6a30965c903		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5930 5084 bytes
font_01_sfnt_off00006a93.bin
6d64bc486c9947f6ed52e8ff2bc7a3a28735669d6d9cd2d2daab4c11a942b2b8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A93 9968 bytes

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