Malicious PDF — malware analysis report

Static analysis result for SHA-256 a28018e5d9074d54…

MALICIOUS

PDF

45.0 KB Created: 2020-08-09 10:51:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea41343f832b257c0820161ce774455b SHA-1: 02a1b575408ebc6f1a383e686c1e768b6c3ed877 SHA-256: a28018e5d9074d54e912434a71cdc22f32a76c3a327d3017a36a94a5dbf145fe
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains the text 'Standard methods of biochemical analysis by d. r. thimmaiah pdf' and a URL that matches the malicious redirector found in the heuristics. This suggests the document is designed to trick users into clicking the malicious link, likely leading to further malware delivery or phishing.

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=standard+methods+of+biochemical+analysis+by+d.+r.+thimmaiah+pdf
    • http://files.willowfree.ca/uploads/1/3/0/7/130740344/xiwodufa.pdf
    • http://files.gladiatorslive.com/uploads/1/3/0/8/130813514/keloxazi.pdf
    • http://files.hirotakakasuga.com/uploads/1/3/1/4/131409309/94636.pdf
    • https://cdn.shopify.com/s/files/1/0432/9376/9894/files/ardhanariswara_stotram_in_telugu_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/7188/8803/files/10084484426.pdf
    • https://cdn.shopify.com/s/files/1/0430/9650/6521/files/2008_ford_f150_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/jatawikupupati.pdf
    • https://cdn.shopify.com/s/files/1/0434/2402/2680/files/niwuvisofebabutudilo.pdf
    • https://cdn.shopify.com/s/files/1/0429/3846/6467/files/suwelizipomisogatujol.pdf
    • https://cdn.shopify.com/s/files/1/0432/3577/0535/files/70995122895.pdf
    • https://cdn.shopify.com/s/files/1/0437/2480/0154/files/pdf_algorithme_informatique.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/surorut.pdf
    • https://cdn.shopify.com/s/files/1/0432/4851/7275/files/retained_earnings_normal_balance.pdf
    • https://cdn.shopify.com/s/files/1/0428/2328/6940/files/fugamovawexodakoxalokabem.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_off000060ff.bin
77904087b816f08a2f5ee9818a2ad18c384fb38502f36f1739ed388c4653473f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60FF 5772 bytes
font_01_sfnt_off00007479.bin
7a02da73c5ff24218d04b188db7d31ceb9303d5dedd43b645f18a615a19d9b6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7479 6068 bytes
font_02_sfnt_off00008429.bin
51cfc460bdf0e07cd42cbeffcf319f43a40c87ce5a90318778b39e7421a8767b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8429 9908 bytes

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