Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d17910bc48159c8…

MALICIOUS

PDF

58.1 KB Created: 2020-09-16 22:00:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c938e7d02b3e4915edf3f8d4c48ad342 SHA-1: fdb7189905384dd77d3654b87ed20c01ce90e0f4 SHA-256: 5d17910bc48159c8569af644d9efad11a457ff56c243c18940d155dc1223a594
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files, indicating a link farm or SEO spamming attempt. One prominent URL, 'https://ttraff.link/wix?keyword=best+free+movie+app+apk', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the nature of the embedded links and the redirector suggest an attempt to lead the user to malicious content or a phishing site.

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.link/wix?keyword=best+free+movie+app+apk
    • http://kabas.staatsmasonry.com/uploads/1/3/1/4/131406717/ziwuxudikigoviluwusi.pdf
    • http://files.amayahshaman.com/uploads/1/3/0/8/130814914/zesajogigo_tumelomagu_nidotesotefasav_fevogogumi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8747/0496/files/diferencia_entre_cetosis_y_cetoacidosis.pdf
    • https://cdn.shopify.com/s/files/1/0430/9640/8218/files/lufivatalutelata.pdf
    • https://cdn.shopify.com/s/files/1/0435/9480/9507/files/miguxulenasisomifoxanigen.pdf
    • https://cdn.shopify.com/s/files/1/0429/2775/1321/files/75226927443.pdf
    • https://834b88e4-70e1-46f0-a09e-b575fe49dd21.filesusr.com/ugd/9ced5d_439ec4c5230e4e08b09d0e76c2cc0880.pdf?index=true
    • https://a1faffad-bd09-4a91-aad2-576b02604979.filesusr.com/ugd/49f5ef_4b72c37198cb404a9eb8758212a52658.pdf?index=true
    • https://156bf388-540e-45ba-95e7-7e3573f7540b.filesusr.com/ugd/d93890_169e9b84224c473c9e112abc4719ebcf.pdf?index=true
    • https://9acfcbb7-0122-49d7-99d3-7250598d87d1.filesusr.com/ugd/e948c1_e7a2432fca564f938c51a2c90a593e43.pdf?index=true
    • https://cdn.shopify.com/s/files/1/0435/6354/8831/files/nenabowojifasugoniwit.pdf
    • https://cdn.shopify.com/s/files/1/0469/0349/2768/files/fadutenogoxutovanenilapek.pdf
    • https://cdn.shopify.com/s/files/1/0433/3659/7654/files/90060108224.pdf
    • https://cdn.shopify.com/s/files/1/0433/9043/5493/files/supercapacitors_101.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009405.bin
8187145963fbf8e0b7977f93bb9cbfc296fb812f6e2b6f40a3c8d31ca5a797a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9405 6744 bytes
font_01_sfnt_off0000a4ec.bin
a4cd1bc69793b2c40890beab207fa6122f1d9bd549c2825b30765d44eecfbfd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4EC 5188 bytes
font_02_sfnt_off0000b689.bin
61f1d4b93d26e80b121dbea2089883ea3c8c750731adc39683ed2c61c82e1547		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB689 10796 bytes

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