Malicious PDF — malware analysis report

Static analysis result for SHA-256 7376b88cd62a8f34…

MALICIOUS

PDF

40.1 KB Created: 2020-08-02 13:01:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5bf081d80b82bf8fe265eb2b813054a8 SHA-1: 3fdf43ac3c8571522d829add3a00631e3b8b0adf SHA-256: 7376b88cd62a8f34681debafbc0dceb0817025f70eb8deb51be13cc73c4c9d8c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The primary link, disguised as an 'acs inorganic chemistry practice exam pdf', leads to `https://ttraff.com/pify?keyword=acs+inorganic+chemistry+practice+exam+pdf`. This heuristic firing, combined with the ML classifier's high confidence, indicates a malicious intent to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of further execution chains.

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=acs+inorganic+chemistry+practice+exam+pdf
    • http://files.keyinmigration.com.au/uploads/1/3/2/6/132695513/senoxipa-vilegevujiko-kopofew-kepanigile.pdf
    • http://files.lauraavnaim.com/uploads/1/3/0/9/130969819/0ec2ee5.pdf
    • http://files.milanfirst.org/uploads/1/3/1/3/131379496/4967024.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6542/5570/files/27731508913.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/last_straight_man_meme.pdf
    • https://cdn.shopify.com/s/files/1/0429/2047/6828/files/5498017553.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/30800096489.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/81077149339.pdf
    • https://cdn.shopify.com/s/files/1/0440/2449/6286/files/fafivusajedaripirefenaze.pdf
    • https://cdn.shopify.com/s/files/1/0433/8620/8406/files/tapuvuduzuvuralunijelafap.pdf
    • https://cdn.shopify.com/s/files/1/0432/4750/1474/files/kogubukusujapejoluvixavo.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/pokomoves.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/daseras.pdf
    • https://cdn.shopify.com/s/files/1/0434/1537/1932/files/jeniwuzuj.pdf
    • https://cdn.shopify.com/s/files/1/0435/3484/4059/files/51145144068.pdf
    • https://cdn.shopify.com/s/files/1/0432/4117/7252/files/88962511213.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c36.bin
d6b3136911c0d88bf501c9b233d555b0b212cdf4b8140f8ac049c77f1bb82793		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C36 5696 bytes
font_01_sfnt_off00006f89.bin
47b9925e09673a70560022f9f5b5b1a6ee435c7594b7cc160348d3049cf52591		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F89 10468 bytes

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