Malicious PDF — malware analysis report

Static analysis result for SHA-256 d38d131a7f7baa93…

MALICIOUS

PDF

47.3 KB Created: 2020-08-30 20:25:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e84c13d421922a6315eab280f19f134 SHA-1: 96827933c725f152d30595854a3a2d22744f7ffb SHA-256: d38d131a7f7baa9361bab215b45452f34707d5f96cd48701db43e67f099c3f18
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating it's a malicious redirector. One prominent link, 'https://ttraff.cc/wix?keyword=samsung+bdf5700+manual', is directly associated with malicious redirector infrastructure. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to external malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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/wix?keyword=samsung+bdf5700+manual
    • https://static.usrfiles.com/ugd/a59130_bcfa6e5572114ae99347cdbbc67f8374.pdf
    • https://static.usrfiles.com/ugd/b8c837_699892ac357241d5b7e9cd3e6467d43f.pdf
    • https://static.usrfiles.com/ugd/41a0b6_ead0514307494645b590eddd60bd0ee5.pdf
    • https://cdn.shopify.com/s/files/1/0434/8493/8390/files/20078724190.pdf
    • https://cdn.shopify.com/s/files/1/0431/1062/9532/files/risk_of_rain_2_chunked_guide.pdf
    • https://cdn.shopify.com/s/files/1/0434/0596/7527/files/analfabetismo_definicion.pdf
    • https://cdn.shopify.com/s/files/1/0466/2489/9237/files/kawasaki_prairie_360_review.pdf
    • https://cdn.shopify.com/s/files/1/0431/0152/0023/files/zusetonumilo.pdf
    • https://cdn.shopify.com/s/files/1/0462/7592/0021/files/l293d_motor_driver_datasheet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5345/6289/files/free_pendulum_charts.pdf
    • https://cdn.shopify.com/s/files/1/0432/4392/9757/files/ct_anatomy_of_abdomen.pdf
    • https://cdn.shopify.com/s/files/1/0439/4831/0683/files/wuvazetusisu.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/petaxotepisivunuza.pdf
    • https://cdn.shopify.com/s/files/1/0443/8884/3686/files/android_adb_commands.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000062a5.bin
12b8be386fd404a15dfb94f03049780f95be9ded0ecaf83bd50572175fbb6103
pdf-font-stream PDF embedded font (sfnt) at offset 0x62A5 5720 bytes
font_01_sfnt_off00007610.bin
c0996e5a41b008d95711f8e9058bb22172ec885e15d783e6f0f69acb87008c95
pdf-font-stream PDF embedded font (sfnt) at offset 0x7610 10180 bytes
font_02_sfnt_off0000993a.bin
3d4749d6100daadf53acbf3b8f0af377f764a48496e0806ab6baa0478a5fbb9e
pdf-font-stream PDF embedded font (sfnt) at offset 0x993A 16364 bytes