Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f7c90dc914e33b4…

MALICIOUS

PDF

40.9 KB Created: 2020-08-07 08:56:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5087245b724d4484a62db5fb54fdcd0 SHA-1: 6d55cb5dd4caffacb4418a823af5d570b01e8f94 SHA-256: 0f7c90dc914e33b44607333a426bb2cdb35706fc5d8565576eb4c066d1a0b329
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by an ML classifier and exhibits characteristics of a link farm, containing numerous external links. One of these links directs to known malicious redirector infrastructure, suggesting an attempt to lead users to harmful content. The document body, though partially corrupted, contains text related to counselling theory and the wkhtmltopdf application, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=person+centred+theory+in+counselling+pdf
    • http://files.ulockitselfstorage.com/uploads/1/3/1/4/131409463/8436405.pdf
    • http://files.maryloutrinkwon.com/uploads/1/3/0/8/130814716/2bfd74acd4d4.pdf
    • http://files.3wheeldriveonline.co.uk/uploads/1/3/1/3/131379496/jaremiku.pdf
    • http://files.foundationforpoliticsandleadership.org/uploads/1/3/1/4/131438567/0857c5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15900382268.pdf
    • https://cdn.shopify.com/s/files/1/0432/4861/5579/files/42157635113.pdf
    • https://cdn.shopify.com/s/files/1/0433/0625/4494/files/best_pc_golf_game.pdf
    • https://cdn.shopify.com/s/files/1/0429/7628/0729/files/90705198315.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/gegexovikorojirokelaxedu.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/vexirukanolidevalujifa.pdf
    • https://cdn.shopify.com/s/files/1/0434/4610/8312/files/86380283350.pdf
    • https://cdn.shopify.com/s/files/1/0433/9505/5777/files/wumegasele.pdf
    • https://cdn.shopify.com/s/files/1/0428/2250/0518/files/84783800420.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/momubogozijivakulepamuj.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/75388652185.pdf
    • https://cdn.shopify.com/s/files/1/0431/4044/8410/files/causative_verbs_have_get_make_let_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/52238697369.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_off00006331.bin
ad1f672b88912862f5c837ba594b77def46db24370ddfa45c5644369a2505482		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 5312 bytes
font_01_sfnt_off00007545.bin
2154b1c75d4f4d5e27d913a18f1e30e439d7c42d2d8805bff7b2aa0af1a2f869		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7545 9740 bytes

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