Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e9c79a05d15a6c5…

MALICIOUS

PDF

54.8 KB Created: 2020-08-16 20:01:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a99af98c4925ff0fa908cb169e201561 SHA-1: 3c44f84afcacf93a701f9ae532df98e22072d8d8 SHA-256: 6e9c79a05d15a6c5d568c375cc95d3b8e68431cfce68fbcb1d71130510c342c7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to attract users searching for specific book PDFs. This suggests a phishing or scam attempt, likely using the embedded links to redirect victims to malicious sites.

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=arithmetic+geometry+book+pdf
    • http://biwepopo.massagerevelstokeayla.com/uploads/1/3/0/9/130969502/neniwugekebavesisuke.pdf
    • http://files.littleempirepodcasts.com/uploads/1/3/1/8/131871625/mitelef_vobamaki_butabuveb.pdf
    • http://files.abidance.org/uploads/1/3/0/8/130874379/mijumado.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/gewinedubifaxaput.pdf
    • https://cdn.shopify.com/s/files/1/0427/5778/3718/files/vofezegikazekoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/7929/5385/files/adobe_reader_for_android_2._2_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/432588730.pdf
    • https://cdn.shopify.com/s/files/1/0434/7238/8246/files/51612313181.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/organic_chemistry_francis_carey_9th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0430/7684/5728/files/proyecto_arquitectonico_de_una_casa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4658/3970/files/52603007178.pdf
    • https://cdn.shopify.com/s/files/1/0438/9103/2216/files/datoforaxow.pdf
    • https://cdn.shopify.com/s/files/1/0430/8857/6673/files/github_push_to_new_repo.pdf
    • https://cdn.shopify.com/s/files/1/0438/4335/4781/files/cambridge_english_test_fce.pdf
    • https://cdn.shopify.com/s/files/1/0433/7162/6659/files/compelling_conversations_vk.pdf
    • https://cdn.shopify.com/s/files/1/0431/5322/7936/files/62685939049.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/minecraft_gullivers_mod_1._7._10.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b07.bin
1542255707ea212440810fa81f08d456dfcabc44478233ea20b94db42a33bf88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B07 5128 bytes
font_01_sfnt_off00009c81.bin
5ac4b79406814f1eb4b4dc01a5d7612c174fb0490e08aa8c3b53f18914da1fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C81 10304 bytes
font_02_sfnt_off0000bfcd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCD 4324 bytes

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