Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f807c0ff91c18b…

MALICIOUS

PDF

40.2 KB Created: 2020-08-11 08:01:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 980becea16b6cc868df203b7b09a38d9 SHA-1: e15e59a9637670f9f819a16da9a1683716ca5d82 SHA-256: 67f807c0ff91c18b585254fbea3498f3118a7bdcdc15b28c5ab9d4a36022089e
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to obscure the malicious redirector.

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=advance+directive+florida+pdf
    • http://files.wskvfm.com/uploads/1/3/2/7/132740463/9415182.pdf
    • http://files.brewhouseboutique.com/uploads/1/3/1/0/131070336/5490711.pdf
    • http://files.agardenforknitters.com/uploads/1/3/1/4/131453124/52c1918ddf8.pdf
    • http://kagibuf.thesurfprofessor.com/uploads/1/3/0/8/130874493/savonenure_perozinilivo_pupupidum_timupozojokag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0447/9169/3463/files/std_11_science_biology_sem_1_textbook.pdf
    • https://cdn.shopify.com/s/files/1/0431/9746/4731/files/35159922534.pdf
    • https://cdn.shopify.com/s/files/1/0429/6186/2810/files/cub_scout_leader_book_no_33221.pdf
    • https://cdn.shopify.com/s/files/1/0430/9748/9561/files/controlled_oral_word_association_test_cowat.pdf
    • https://cdn.shopify.com/s/files/1/0428/4468/4454/files/28110398235.pdf
    • https://cdn.shopify.com/s/files/1/0433/7228/2008/files/tiwijeriwosi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/41448402009.pdf
    • https://cdn.shopify.com/s/files/1/0433/2666/8952/files/19281010982.pdf
    • https://cdn.shopify.com/s/files/1/0428/8466/1414/files/82750306306.pdf
    • https://cdn.shopify.com/s/files/1/0430/5892/1621/files/73073287075.pdf
    • https://cdn.shopify.com/s/files/1/0440/0365/5830/files/45564690277.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_off000053c1.bin
232a672f09a32619fddd9841735d418e430be05749304a9f26b55b2b2b9bc650		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53C1 4808 bytes
font_01_sfnt_off00006421.bin
722dd55157e9f7b67abd314164c3f1e900638548157b15a4161e0f4a0768636b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6421 9888 bytes
font_02_sfnt_off000085f5.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85F5 4324 bytes

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