Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d179ec8357310c1…

MALICIOUS

PDF

56.3 KB Created: 2020-08-24 01:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1914cd486f390e5cc4dc7aebace6a636 SHA-1: a917f2f40ea69c77dadce7c94f66c25d4289ad7d SHA-256: 5d179ec8357310c110a640e3bfc2987917ebd83ee6b0fcf563dc795eae87096a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains the malicious URL, suggesting an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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=al+masry+al+youm+pdf
    • http://files.guysalvidge.com/uploads/1/3/1/4/131483281/bewapopedefak-dajog-wutevapot.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0454/4344/8990/files/fopafomigonalufalobaro.pdf
    • https://cdn.shopify.com/s/files/1/0430/7507/6258/files/lademamopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/joxoxuvurasad.pdf
    • https://cdn.shopify.com/s/files/1/0438/5443/0368/files/class_attendance_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0428/0818/0895/files/thinking_with_type_2nd_revised_and_expanded_edition.pdf
    • https://cdn.shopify.com/s/files/1/0451/0230/1349/files/mythic_adventures.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7266/files/bergey_s_manual_of_determinative_bacteriology_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0428/4216/1319/files/11037385305.pdf
    • https://cdn.shopify.com/s/files/1/0435/9153/2699/files/electronic_devices_vocabulary_answers.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/linear_harmonic_oscillator.pdf
    • https://cdn.shopify.com/s/files/1/0430/2536/7193/files/87842434838.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5745/files/canvas_noun_form.pdf
    • https://cdn.shopify.com/s/files/1/0431/7170/9092/files/33279145905.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006cf4.bin
b67403f9a24271000dd973a9bc811612d2d2bfdfe0ad6379022d0af177cc0828		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CF4 4808 bytes
font_01_sfnt_off00007d40.bin
05355ba53245d81a20a92aa640c64174c5ed7dcc4684839f584404d36aa80242		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D40 10744 bytes
font_02_sfnt_off0000a1e6.bin
b19ebede08b3e595687df26c01cf5bea83305628d0a8a4124e0aead02c80636a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1E6 21288 bytes
font_03_sfnt_off0000c5da.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DA 4324 bytes

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