Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f4b4e3bd2e48e9…

MALICIOUS

PDF

69.8 KB Created: 2020-08-13 22:58:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3cf570440c598fa04d3222eaea2b669 SHA-1: 8456d29149706e189b0e74090bc5b66db971830b SHA-256: e8f4b4e3bd2e48e97a5380a8acc542a50a584f051527e99f477592f56d6dd1af
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=long+armed+squid+creature+report'. This URL is likely part of a phishing or malware distribution chain. The presence of a large number of external PDF links, many hosted on cdn.shopify.com, suggests a link farm or SEO poisoning tactic to increase visibility. The ML classifier also strongly indicated maliciousness.

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=long+armed+squid+creature+report
    • http://files.littleleafflutestore.com/uploads/1/3/2/6/132695829/689d6e200a704.pdf
    • http://pakili.christianlitforafrica.org/uploads/1/3/1/1/131164250/9240955.pdf
    • http://webib.charlottedixon.net/uploads/1/3/2/8/132815176/lexug.pdf
    • http://lisatitu.soul-serenity.co.uk/uploads/1/3/2/6/132681670/sejenugumaxuja_likib_sipazovagesi.pdf
    • http://zutulupov.vcoonrodphotography.com/uploads/1/3/1/6/131606289/tisivewejofopumaje.pdf
    • https://cdn.shopify.com/s/files/1/0440/0431/1190/files/bejali.pdf
    • https://cdn.shopify.com/s/files/1/0433/8017/9107/files/38109212061.pdf
    • https://cdn.shopify.com/s/files/1/0431/7128/3098/files/40525069409.pdf
    • https://cdn.shopify.com/s/files/1/0431/7950/7880/files/tulufudefopekalutanunot.pdf
    • https://cdn.shopify.com/s/files/1/0432/0188/8416/files/rududokazejewebeja.pdf
    • https://cdn.shopify.com/s/files/1/0427/8275/2935/files/71645737245.pdf
    • https://cdn.shopify.com/s/files/1/0435/3101/0199/files/96276708737.pdf
    • https://cdn.shopify.com/s/files/1/0440/7151/8373/files/51582330267.pdf
    • https://cdn.shopify.com/s/files/1/0428/0962/2691/files/jee_advanced_b_arch_question_paper.pdf
    • https://cdn.shopify.com/s/files/1/0431/3841/6801/files/19009236318.pdf
    • https://cdn.shopify.com/s/files/1/0432/7243/7910/files/sample_agreement_between_two_parties.pdf
    • https://cdn.shopify.com/s/files/1/0429/4852/6246/files/zabuminonuzar.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/zobinogogikaranuxegosetow.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3a8.bin
fbbff33c006991f63a3cb587b56d2a0f3d1c16125f94384200c09ea99253fd5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3A8 5428 bytes
font_01_sfnt_off0000e602.bin
5afc8ef7c45b8eb4a112565d57d419cb1e57b8a0eff524c137b988835ec7f174		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE602 10456 bytes

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