Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dff7c04a8664513…

MALICIOUS

PDF

44.8 KB Created: 2020-08-07 00:08:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8e5e38275fdc5e715c799ee880ef8c6 SHA-1: 7fa301d84ef6a825fcbac9ed79c3003d7be1e7e0 SHA-256: 7dff7c04a86645137abb296df80dcb94adb066ea685c41c9f5daf6eda41f59d6
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users through the document's content, which appears to be obfuscated text related to 'life skills counseling', to click on the malicious redirector URL.

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=life+skills+counseling+pdf
    • http://files.heistawards.com/uploads/1/3/1/3/131380687/8356328.pdf
    • http://files.thecarolinasportsdistrict.org/uploads/1/3/1/3/131383426/famakixat.pdf
    • http://files.dingoden.net/uploads/1/3/2/6/132683264/64c6eebb5.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/2717849214.pdf
    • https://cdn.shopify.com/s/files/1/0437/9456/3229/files/history_of_baghdad_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/bujulubamijepixajut.pdf
    • https://cdn.shopify.com/s/files/1/0431/4087/4408/files/sopotak.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/baloxurebivive.pdf
    • https://cdn.shopify.com/s/files/1/0435/2930/6263/files/gaxafopowezabuliri.pdf
    • https://cdn.shopify.com/s/files/1/0435/9431/7981/files/puletazuvujononugevoke.pdf
    • https://cdn.shopify.com/s/files/1/0434/5937/9357/files/bokebafaguluwuzewu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/54150461009.pdf
    • https://cdn.shopify.com/s/files/1/0452/5244/4320/files/difference_between_attitude_and_behaviour.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7913/files/53347741166.pdf
    • https://cdn.shopify.com/s/files/1/0434/6213/1869/files/92653227883.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_off00007321.bin
d29b0533e8ddc0350129ea41785fa4cf5ad26b85b839951ed7a53dc19fbc4abb
pdf-font-stream PDF embedded font (sfnt) at offset 0x7321 5024 bytes
font_01_sfnt_off0000845e.bin
e13f464f2fa7bddae90fe4282dc0ddcbb4f5a5b3ae4dec9ca244a6b2c3d590a3
pdf-font-stream PDF embedded font (sfnt) at offset 0x845E 9840 bytes