Malicious PDF — malware analysis report

Static analysis result for SHA-256 14267413b0f2a4df…

MALICIOUS

PDF

48.2 KB Created: 2020-08-04 01:50:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 64011fa4c1bc126af379b992ca3a615d SHA-1: 65ee762d4baf69de35556ae382e4b13042dc08dd SHA-256: 14267413b0f2a4df39a6573defae93f84ec745c0a73a0912e3c66bbd5b0d82c1
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that suggest a link farm or SEO manipulation tactic, likely intended to direct users to malicious sites. No scripts were extracted, but the presence of numerous links points towards a phishing or redirection attack.

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=basics+of+computer+hardware+and+networking+pdf
    • http://files.stpaulspreschool.net/uploads/1/3/1/1/131164132/fc734533744d01.pdf
    • http://files.xenastrategies.com/uploads/1/3/2/6/132682623/guraguzos_daterigaveman_belutibolafik_wijemu.pdf
    • http://files.malcolmcounseling.com/uploads/1/3/1/6/131606603/5215416.pdf
    • http://files.countryblastradio.com/uploads/1/3/0/9/130970014/rovikepax-dunazubobof.pdf
    • http://files.manekrush.org/uploads/1/3/2/6/132682070/1823248.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1010/5255/files/67935376092.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2471/files/zutofobeno.pdf
    • https://cdn.shopify.com/s/files/1/0428/7637/1110/files/although_vs_despite.pdf
    • https://cdn.shopify.com/s/files/1/0435/9726/7112/files/dafalomidavabakurepok.pdf
    • https://cdn.shopify.com/s/files/1/0434/1117/7629/files/xamunu.pdf
    • https://cdn.shopify.com/s/files/1/0431/3972/7509/files/mario_brothers_ps3.pdf
    • https://cdn.shopify.com/s/files/1/0430/2356/4957/files/48582119.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7217/files/90459736879.pdf
    • https://cdn.shopify.com/s/files/1/0447/1295/1961/files/edge_of_the_empire_core_rulebook.pdf
    • https://cdn.shopify.com/s/files/1/0432/8577/4491/files/gupigamimoruvawefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3192/8730/files/37084586532.pdf
    • https://cdn.shopify.com/s/files/1/0428/9495/0556/files/1524891576.pdf
    • https://cdn.shopify.com/s/files/1/0433/9836/5340/files/19069935804.pdf
    • https://cdn.shopify.com/s/files/1/0430/7386/3842/files/41927228069.pdf
    • https://cdn.shopify.com/s/files/1/0430/1671/6437/files/11718859810.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_off00006ed5.bin
5950c23f59166880cfaf8857ddb80d13c0d9726888da9a2df41547ea92aa6aca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED5 5624 bytes
font_01_sfnt_off000081db.bin
de40c03439e461e667cf64004a6d60fb713acf399757199ae2f43d9262f57675		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81DB 10340 bytes
font_02_sfnt_off0000a53d.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA53D 4324 bytes

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