Malicious PDF — malware analysis report

Static analysis result for SHA-256 71579f50f7ce76e5…

MALICIOUS

PDF

60.4 KB Created: 2020-08-21 00:33:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a11f89a6fd39b48c53d6d4ebd45bd820 SHA-1: 578dbc37c287d48dcdbb3d959af3504c3c601e1e SHA-256: 71579f50f7ce76e5c4a3fddf383e1abbd644f8bb451fb798c9485588ecec7bca
154 Risk Score

Malware Insights

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

The PDF contains embedded links that lead to a known malicious redirector, disguised as a job application form or learning template. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or redirection scheme designed to obfuscate the final malicious destination.

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=inquiry+based+learning+unit+template
    • http://kuzudus.baileyandassociatescounseling.com/uploads/1/3/2/6/132681333/pidaxufu-susubimugu-rejodix.pdf
    • http://files.elbowtreecooperative.com/uploads/1/3/1/4/131453299/zuzuwojanimam_wavekuli.pdf
    • http://futeruxam.strutboutiqueshop.com/uploads/1/3/1/6/131606069/nudap-xoxitokif-dagum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0445/6205/5332/files/job_application_form_example.pdf
    • https://cdn.shopify.com/s/files/1/0429/6579/4965/files/magemafexewopivaz.pdf
    • https://cdn.shopify.com/s/files/1/0438/1035/7405/files/capital_markets_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/3000/3358/files/zovawitibilij.pdf
    • https://cdn.shopify.com/s/files/1/0454/6166/7992/files/70540360105.pdf
    • https://cdn.shopify.com/s/files/1/0435/5316/1367/files/kakibilatowujafepekewagus.pdf
    • https://cdn.shopify.com/s/files/1/0433/7133/1734/files/64755784836.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/accident_nollywood_movie.pdf
    • https://cdn.shopify.com/s/files/1/0437/6713/6408/files/jebemoroxunelabag.pdf
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/19354303614.pdf
    • https://cdn.shopify.com/s/files/1/0431/8524/2269/files/87523934048.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_off0000a027.bin
aaf7fd3486ba055ec23dbd07fb62e2c48b7a20a8dd16061c46c2dfab609a8f47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA027 5356 bytes
font_01_sfnt_off0000b230.bin
faaa9144aa2f7c2ba7189b94e087b2a0b9311f2112c9b42224911c15c1cdae79		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB230 10592 bytes
font_02_sfnt_off0000d634.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD634 4324 bytes

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