Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c4120bc4dd71481…

MALICIOUS

PDF

41.5 KB Created: 2020-08-02 16:55:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e96f6c6a52c993e243579b4f64b859b4 SHA-1: 0f42bed84a2114c97b71b7b5c0d77c97c1040070 SHA-256: 4c4120bc4dd71481948330ea9c663c7b18c7ab660d847ba1868de5e34f6b429d
154 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, embedding a large number of external links. The primary malicious URL identified is https://ttraff.cc/pify?keyword=zelda+2+guide, which is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several benign-looking Shopify URLs, suggesting a lure to a malicious site disguised within a seemingly legitimate document.

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=zelda+2+guide
    • http://files.nswansonarts.com/uploads/1/3/1/4/131453124/pifinadida_rarutox_kizev_sofug.pdf
    • http://files.tylewiscancerfoundation.org/uploads/1/3/1/4/131483184/ee2d3ba2747.pdf
    • http://files.chinainblackandwhite.org/uploads/1/3/1/3/131381374/zeguza.pdf
    • http://files.vulturepeakmines.com/uploads/1/3/1/4/131453267/1339084.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88065476392.pdf
    • https://cdn.shopify.com/s/files/1/0435/5283/3687/files/68262363620.pdf
    • https://cdn.shopify.com/s/files/1/0431/6348/4315/files/kozazifutezoviwom.pdf
    • https://cdn.shopify.com/s/files/1/0434/0734/3772/files/movixobabepofejukezoza.pdf
    • https://cdn.shopify.com/s/files/1/0438/6501/4437/files/jilaxekukigiw.pdf
    • https://cdn.shopify.com/s/files/1/0427/9477/8791/files/4838641158.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gopag.pdf
    • https://cdn.shopify.com/s/files/1/0439/2783/0696/files/magic_armor_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/xanawagop.pdf
    • https://cdn.shopify.com/s/files/1/0438/8411/8171/files/97903005223.pdf
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/94465015495.pdf
    • https://cdn.shopify.com/s/files/1/0431/6630/2376/files/zexejawak.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/3225547592.pdf
    • https://cdn.shopify.com/s/files/1/0440/9055/6568/files/45346279304.pdf
    • https://cdn.shopify.com/s/files/1/0431/1692/0996/files/gupikuvanu.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_off000066e5.bin
812f59d2f6603a3ca23e8355e82127f3bac60a82d0eaa38b397c483cefac945f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66E5 4808 bytes
font_01_sfnt_off00007753.bin
a0cefd46b758310869ed0dd38dc871bd6a4bdb76177418da7c1f3435e750867f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7753 9896 bytes

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