Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7a78ea925e2111e…

MALICIOUS

PDF

48.7 KB Created: 2020-08-09 15:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 332ca6365e9cf2774300b26489ec7358 SHA-1: 8fb609f692bafa1cbdad916c7abdd8d19400c47a SHA-256: a7a78ea925e2111e8452fd7cb25c187d4a0ae24ab64fb6ab68ea756b747cba30
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 of which point to a link farm hosted on cdn.shopify.com and a malicious redirector at ttraff.com. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of links to known malicious infrastructure. The document body itself is heavily obfuscated but contains the malicious URL, suggesting a lure to trick users into clicking through to potentially harmful content.

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=absceso+pulmonar+pdf+pediatria
    • http://files.chenyilei.net/uploads/1/3/1/4/131437775/xopotivanimub.pdf
    • http://files.creativeiqsf.com/uploads/1/3/1/3/131382028/1799309.pdf
    • http://files.corezone.online/uploads/1/3/0/7/130775405/duzapazuzija_gojinijojuje_rebudezelex_gevavam.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/70377705045.pdf
    • https://cdn.shopify.com/s/files/1/0437/5491/3943/files/lorogupofoxevuzo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1887/1207/files/10th_new_syllabus_social_science_volume_2_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/4475/5866/files/active_listening_cambridge.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/fixovazinuwodatuzatuvu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2952/7709/files/455_rancher_parts.pdf
    • https://cdn.shopify.com/s/files/1/0432/2436/7262/files/32023645030.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/13964741728.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3871/files/28621452416.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tefukina.pdf
    • https://cdn.shopify.com/s/files/1/0437/3689/1544/files/17099564370.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9711/files/76836841526.pdf
    • https://cdn.shopify.com/s/files/1/0430/7910/6724/files/67550127658.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_off000072e4.bin
96645e9b2d8cbba367da0b9075f3d55dc479b495b0b217da4b6bbed35bb5fb32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E4 5312 bytes
font_01_sfnt_off000084c0.bin
46dbb94ab4d7726060f169010dafd0f026b1b7e30a5ac7caec5f7ffb4e684479		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C0 10240 bytes
font_02_sfnt_off0000a7b6.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7B6 4324 bytes

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