Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c2aa0e70de9277…

MALICIOUS

PDF

39.4 KB Created: 2020-08-19 12:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1301516043b71a6945b22e2b1129ca9c SHA-1: 93e994afa1acf96bd8cee4a398c5f286417ba01e SHA-256: 16c2aa0e70de9277f7393e63a83282a887b2d6f9c7f71b8094244cefe785ac61
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, a common tactic for SEO link farms or redirecting users to malicious sites. One of the embedded URLs, 'https://ttraff.ru/pify?keyword=iphone+x+buttonless+ringtone+free', is flagged as malicious. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

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=iphone+x+buttonless+ringtone+free
    • http://files.crimsonmist.com/uploads/1/3/0/7/130738696/7cb1f0a1340257.pdf
    • http://begime.biglittlebrains.com/uploads/1/3/1/1/131164250/jogixa.pdf
    • http://files.chrisgriffithdesigns.com/uploads/1/3/1/0/131070098/6625889.pdf
    • http://files.olmlancers.com/uploads/1/3/1/3/131381679/5c4eae.pdf
    • http://files.mcclainmatthewsinsurance.com/uploads/1/3/1/4/131409090/7232005.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/6783/4517/files/big_bend_national_park_trail_map.pdf
    • https://cdn.shopify.com/s/files/1/0433/3341/9166/files/harbor_freight_winch_mount.pdf
    • https://cdn.shopify.com/s/files/1/0434/9893/0341/files/formal_dress_hire_christchurch_nz.pdf
    • https://cdn.shopify.com/s/files/1/0436/9167/1705/files/38484500212.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/nogerunesosuxusi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7269/files/lesexavukorod.pdf
    • https://cdn.shopify.com/s/files/1/0435/0597/5462/files/definition_of_phonology_according_to_experts.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/xufenelideduwoxaxig.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/engineering_mechanics_dynamics_13th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0440/1017/6662/files/21352174515.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/97401056517.pdf
    • https://cdn.shopify.com/s/files/1/0432/7433/8454/files/sabelexariwe.pdf
    • https://cdn.shopify.com/s/files/1/0435/0391/1076/files/axis_bank_current_account_debit_card_application_form.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ca1.bin
496c9375383454dadf0f96d9ce2d45e51e272ef92e9c65c837850c45b5af0818		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CA1 5096 bytes
font_01_sfnt_off00006dee.bin
1df08a677280d479dc8f0621775c3a3af6b02e31f63a633d2324bcc7d0284c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEE 10168 bytes

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