Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c6f0697c5ae35f…

MALICIOUS

PDF

47.4 KB Created: 2020-08-04 01:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9c3bb0ea508622603f4f712344787b0 SHA-1: 73c8206240a31fd3e38548733c9bb1d8feeedc78 SHA-256: a4c6f0697c5ae35f6499abe5fe85f738ba2c1da09c03663accc3e839243275dd
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with a critical heuristic firing for a malicious redirector at 'https://ttraff.com/pify?keyword=bootstrap+css+tutorial+pdf'. The document body, though heavily obfuscated, contains text related to the lure. The ML classifier strongly indicates maliciousness, and the presence of a redirector suggests a phishing or malware delivery attempt.

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=bootstrap+css+tutorial+pdf
    • http://files.horleycricketclub.co.uk/uploads/1/3/1/4/131406893/213a7092049.pdf
    • http://files.zoepantinjewelry.com/uploads/1/3/0/7/130775998/wozanegowoveso.pdf
    • http://files.sergiocote.com/uploads/1/3/1/4/131455621/gotop-dagipak-revojezuwuxiwu-mosodenon.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/kusozozobegakej.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/51686393220.pdf
    • https://cdn.shopify.com/s/files/1/0428/5336/7975/files/36984747186.pdf
    • https://cdn.shopify.com/s/files/1/0429/7034/9731/files/24018779959.pdf
    • https://cdn.shopify.com/s/files/1/0432/2790/6206/files/wenev.pdf
    • https://cdn.shopify.com/s/files/1/0431/4241/4492/files/colander_microeconomics.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/zirobutoxuzobesaki.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/kuguwidedogafef.pdf
    • https://cdn.shopify.com/s/files/1/0430/0704/9887/files/walmart_grant_login.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/tedovafejerezarus.pdf
    • https://cdn.shopify.com/s/files/1/0431/7449/4369/files/wamusuzalilugaguxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3042/9346/files/72731607004.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_off00006483.bin
ccf897fe5d09e40fcc8e2efb71d63a72041195f32e46a700c0925b58b2d7ee39
pdf-font-stream PDF embedded font (sfnt) at offset 0x6483 4856 bytes
font_01_sfnt_off00007515.bin
dcbbc73d0712558902932d0152913fc4cdf7a62332042c41696c3b92367f0ca4
pdf-font-stream PDF embedded font (sfnt) at offset 0x7515 14444 bytes
font_02_sfnt_off0000a2ae.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA2AE 4324 bytes