Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bb08359320a645…

MALICIOUS

PDF

45.0 KB Created: 2020-08-27 17:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e27b51e3bf13f1021edc97f12d388ba1 SHA-1: 100d3f61655ac7a983358c63289b32615064180b SHA-256: 33bb08359320a645f0350a591cf4bbee8336bf859d4fa95da8fef0e51d631734
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link that redirects to a known malicious infrastructure, disguised as 'hp printer 3630 instructions'. The document body, though heavily obfuscated, also contains this URL. The PDF also features a large number of embedded links, many hosted on Shopify, which is indicative of a link farm used for SEO poisoning or to obscure the final malicious destination. No scripts were extracted from this sample.

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=hp+printer+3630+instructions
    • http://pagolex.losaltosxc.com/uploads/1/3/1/3/131380598/4551451.pdf
    • http://files.stbartshighsprings.org/uploads/1/3/0/7/130776341/wafoke.pdf
    • http://files.keepitcooltompkins.org/uploads/1/3/0/7/130775792/soxex_panokunodijazo.pdf
    • http://files.canadianclubmx.com/uploads/1/3/2/3/132302963/tixunamar-degiro-zuroxakogu-kufadurazaked.pdf
    • https://cdn.shopify.com/s/files/1/0433/0133/9304/files/vuzawi.pdf
    • https://cdn.shopify.com/s/files/1/0432/0142/9662/files/desemakodekorakajuk.pdf
    • https://cdn.shopify.com/s/files/1/0432/3989/9304/files/28347840024.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/67641838088.pdf
    • https://cdn.shopify.com/s/files/1/0433/8424/2337/files/heavy_truck_labor_time_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/7234/7550/files/dolexinopodideta.pdf
    • https://cdn.shopify.com/s/files/1/0435/6656/3487/files/mott_s_applesauce_nutrition_information.pdf
    • https://cdn.shopify.com/s/files/1/0430/8615/1833/files/worugepubefizijet.pdf
    • https://cdn.shopify.com/s/files/1/0438/6727/5424/files/gap_uk_children_s_size_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/9286/0327/files/21227889187.pdf
    • https://cdn.shopify.com/s/files/1/0431/5355/5624/files/djmaza_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0432/5569/3470/files/65272123770.pdf
    • https://cdn.shopify.com/s/files/1/0432/0264/2075/files/98661814709.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/biphasic_waveform_ultrasound_radiology.pdf
    • https://cdn.shopify.com/s/files/1/0434/7772/9442/files/78298080684.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_off00007263.bin
d14a7ada18afcb8f20679b9b52d35b0584af72e967e866fcdb2d4c6ae0d34748		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7263 5104 bytes
font_01_sfnt_off000083c2.bin
a935b00ee8042217f731945b4c027def5269927fddeaec0943dc71953e661e63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83C2 10380 bytes

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