Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5b57729742a523…

MALICIOUS

PDF

38.9 KB Created: 2020-08-03 11:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 91fd7c0a8fc9c2190b5d55ecd4361808 SHA-1: 0e0e988e8d080b87f1bdd8a197ba6e8e146445fc SHA-256: 7d5b57729742a523bef18c0503161e49452ac7ba734388601216738f8ba29634
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a malicious URL, disguised with text suggesting it is a generator manual. The PDF also hosts a large number of external PDF links, likely for SEO manipulation to improve search engine ranking for malicious content. The ML classifier strongly indicated maliciousness, and the embedded URL is a known 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=generac+generator+manual+pdf
    • http://files.mountainmovingjourney.com/uploads/1/3/2/7/132741556/ranodejonusorid.pdf
    • http://files.ilonayoga.com/uploads/1/3/0/7/130776131/befapituwado.pdf
    • http://files.vztango.com/uploads/1/3/2/7/132712333/39ffc880cfc.pdf
    • http://files.nordicflippedlearning.org/uploads/1/3/0/7/130739415/6485463.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/niwajonibaboxelobakovom.pdf
    • https://cdn.shopify.com/s/files/1/0433/1044/8795/files/husqvarna_rz5424_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sasukeseduvemuledup.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/nijuvit.pdf
    • https://cdn.shopify.com/s/files/1/0429/2699/7663/files/79637608978.pdf
    • https://cdn.shopify.com/s/files/1/0440/9055/6568/files/88073048581.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/butujevubokidi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6845/6086/files/80955233557.pdf
    • https://cdn.shopify.com/s/files/1/0434/3676/9437/files/mount_and_blade_warband_viking_conquest_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0436/9013/1609/files/bee_venom_collector_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0432/9875/0619/files/bisuluvejafavitaruvibules.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/47790394223.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_off000050a0.bin
2898366c26b1e9bf681b238314a08b420c1d79772a45dec5aabe577256d57b50
pdf-font-stream PDF embedded font (sfnt) at offset 0x50A0 5328 bytes
font_01_sfnt_off000062b1.bin
fdea5f2b0f230773bce91c0053a1e8044bae5b6e777671a14fac6bd45168161e
pdf-font-stream PDF embedded font (sfnt) at offset 0x62B1 14312 bytes