Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3309dbb383437bd…

MALICIOUS

PDF

50.4 KB Created: 2020-08-31 08:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19700097aa47ffd33386eb64c89919d8 SHA-1: bcd0c3c477a630a15ff583f63a790615134df2d2 SHA-256: c3309dbb383437bd592dd159d21bd4704726140fc89b2f28c1581900b76917f9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating it's a redirector link to known malicious infrastructure. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external resources. The primary malicious URL identified is https://ttraff.cc/wix?keyword=learning+the+17+indisputable+laws+of, which is likely used to lure victims into clicking through to a malicious site.

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=learning+the+17+indisputable+laws+of
    • https://static.usrfiles.com/ugd/6d59ab_61e62caad9f9468fa2c6b0cc0359deff.pdf
    • https://static.usrfiles.com/ugd/b8c837_9f0762c458cd4268a4fb6e90216b3018.pdf
    • https://static.usrfiles.com/ugd/63d3ad_ac273d1048d54dd8b5be493dfd44e1a6.pdf
    • https://static.usrfiles.com/ugd/87d215_4976dd24a9c045e2b1609dab18455391.pdf
    • https://cdn.shopify.com/s/files/1/0431/8091/6893/files/cholesterol_lowering_foods_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/6393/4109/files/biomagnification_and_bioaccumulation.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/zirawegexus.pdf
    • https://static.usrfiles.com/ugd/2ca09c_ad012d7eab1f43d7bb7c13d23054d072.pdf
    • https://static.usrfiles.com/ugd/8ba634_895292b89ea5472eab26c8c603a6c0a4.pdf
    • https://static.usrfiles.com/ugd/7598fa_40e52e5b2779477f8265d001da43a8c3.pdf
    • https://static.usrfiles.com/ugd/5438e3_a2cb168136134e1da89b1668c43ca896.pdf
    • https://cdn.shopify.com/s/files/1/0433/8266/9464/files/97761332721.pdf
    • https://cdn.shopify.com/s/files/1/0432/7266/7296/files/android_chronometer_format_milliseconds.pdf
    • https://cdn.shopify.com/s/files/1/0454/6779/5608/files/aulus_cornelius_celsus_de_medicina.pdf
    • https://cdn.shopify.com/s/files/1/0435/2363/7402/files/goxojasuximuno.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_off000086e2.bin
c40739f5de28de3a3c27029e06f3ecacfc99f5add9552255a1d6bd6b8a3c2b67
pdf-font-stream PDF embedded font (sfnt) at offset 0x86E2 5608 bytes
font_01_sfnt_off00009a03.bin
72c1b4626969e90f5873cfc71e1ad86fac668b97aeba1df3d3cb1bb9aa1077a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x9A03 10240 bytes