Malicious PDF — malware analysis report

Static analysis result for SHA-256 16de82a5b37c4a1a…

MALICIOUS

PDF

55.3 KB Created: 2020-08-05 22:51:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 745c9db89a987e86c9ffdb4ba3aa5df5 SHA-1: cee87f75a6dbb414211d5abbd790b1506e0dc980 SHA-256: 16de82a5b37c4a1a04ee15b7f4b71d35b747dc445d663e3778db8103383149d7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector at 'https://ttraff.cc/pify?keyword=ielts+speaking+marking+criteria+pdf'. The document body, though heavily obfuscated, appears to contain references to IELTS and links to various PDF files hosted on Shopify and other domains, suggesting a link farm or SEO manipulation tactic. The ML classifier strongly indicates maliciousness, and the presence of embedded links points towards a phishing or redirection attack.

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=ielts+speaking+marking+criteria+pdf
    • http://files.becomingjewish.net/uploads/1/3/2/6/132681826/kaxijazuweka-pewepu-xoxifir.pdf
    • http://files.lindakriebel.com/uploads/1/3/2/6/132695416/2323581.pdf
    • http://files.belarusian-songs.com/uploads/1/3/0/8/130814390/kupofixuleremom.pdf
    • http://gotixuwe.prestigesupport.org/uploads/1/3/0/7/130775219/zovew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0427/4041/6678/files/gediluwawufifi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3049/4878/files/48231805077.pdf
    • https://cdn.shopify.com/s/files/1/0429/3646/7623/files/2_mb_to_kb.pdf
    • https://cdn.shopify.com/s/files/1/0429/5491/5993/files/zifiwapu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4620/7650/files/zegixofomemininapejepel.pdf
    • https://cdn.shopify.com/s/files/1/0439/6577/6030/files/kegogutobosivewizired.pdf
    • https://cdn.shopify.com/s/files/1/0440/8036/5720/files/31209118336.pdf
    • https://cdn.shopify.com/s/files/1/0433/4016/9366/files/7184055746.pdf
    • https://cdn.shopify.com/s/files/1/0435/4700/0983/files/bidaxegolavi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8764/3302/files/pejopix.pdf
    • https://cdn.shopify.com/s/files/1/0430/2631/7473/files/roxilevanasekixeba.pdf
    • https://cdn.shopify.com/s/files/1/0435/1367/5928/files/58703975770.pdf
    • https://cdn.shopify.com/s/files/1/0433/1733/0075/files/66677720627.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/wejitogukasive.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_off00008dcc.bin
66878c0b7df886c81d9cda828126ee62d0ca32903220b640f6933fb7debca943		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCC 5156 bytes
font_01_sfnt_off00009f34.bin
48717068c1a10123d4b4e41b098de0867c9333bba2e900ae1169a576849b40bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F34 10256 bytes
font_02_sfnt_off0000c22e.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC22E 4324 bytes

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