Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3684a31c2a29ff0…

MALICIOUS

PDF

45.9 KB Created: 2020-08-09 19:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1574154d9b3cedd99f3f2f965d7363d8 SHA-1: 3b8707bfaa05c294ee2dab25bf86b6e00c16eddc SHA-256: a3684a31c2a29ff0ebe0ef35ef475194fa7e6c9ea0647af0d731d46d92a3ec94
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, identified as a link farm, designed to redirect users to external content. One prominent URL, 'https://ttraff.ru/pify?keyword=aptitude+test+books+free+download+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'aptitude test books free download pdf', suggesting a lure to entice users to click the malicious links.

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.ru/pify?keyword=aptitude+test+books+free+download+pdf
    • http://files.cowatercongress.org/uploads/1/3/1/4/131406751/vanunetaloj.pdf
    • http://files.waynerichards.org/uploads/1/3/0/7/130738841/fasugavuf_nopimamalexika.pdf
    • http://files.misslncreations.com/uploads/1/3/1/3/131381428/gafago-wirikufubod-mojediseleva.pdf
    • http://files.westlakechoirs.org/uploads/1/3/1/4/131407183/runazotifivopa_gosezutidub_wulusem.pdf
    • http://files.themazzage.com/uploads/1/3/0/7/130775750/7dd7e68417a26d7.pdf
    • http://files.westlakechoirs.org/uploads/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71409998288.pdf
    • https://cdn.shopify.com/s/files/1/0433/8624/1187/files/deductive_bible_study_method.pdf
    • https://cdn.shopify.com/s/files/1/0435/9228/6363/files/31102463389.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/towiduligowiwuni.pdf
    • https://cdn.shopify.com/s/files/1/0434/2562/8327/files/plus_two_business_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5335/files/desig.pdf
    • https://cdn.shopify.com/s/files/1/0448/3717/5456/files/fmaj7_ukulele_chord.pdf
    • https://cdn.shopify.com/s/files/1/0438/4541/9165/files/principles_of_macroeconomics_case_fair_oster.pdf
    • https://cdn.shopify.com/s/files/1/0441/1329/7560/files/64920318526.pdf
    • https://cdn.shopify.com/s/files/1/0431/7695/1957/files/30682498405.pdf
    • https://cdn.shopify.com/s/files/1/0441/3734/9272/files/ferguson_1967_mathematical_statistics.pdf
    • https://cdn.shopify.com/s/files/1/0430/6301/7629/files/pimiv.pdf
    • https://cdn.shopify.com/s/files/1/0429/4869/0076/files/joraf.pdf
    • https://cdn.shopify.com/s/files/1/0437/3417/1800/files/wisisegukupujigut.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/budget_2020_free_download.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_off00007528.bin
1c17bd8ee261f60e38a01d4a169a0e79c462136c59291de43f671749f0b1a38c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7528 5320 bytes
font_01_sfnt_off0000875e.bin
67be0f89e75e3bd34677d52f54c1925b597b86a093a448b74339d0fca7bb74c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x875E 10164 bytes

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