Malicious PDF — malware analysis report

Static analysis result for SHA-256 c53b892e3821120f…

MALICIOUS

PDF

64.2 KB Created: 2020-08-09 20:52:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0783a661616e23e29a808aaa0c9dacff SHA-1: 5900de88678dba28adfd90eb3c59def72944e7f3 SHA-256: c53b892e3821120fec451f8c86b9f9488337f8215bb0190e931c6efb861f0b47
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be corrupted or obfuscated, but the presence of the URL 'https://ttraff.cc/pify?keyword=catalysis+mcq+pdf' suggests a lure related to academic content, likely to redirect users to malicious sites or download further payloads.

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/pify?keyword=catalysis+mcq+pdf
    • http://files.alikellyphotography.com/uploads/1/3/1/1/131164488/5d1766497a.pdf
    • http://files.esubtraininghub.com/uploads/1/3/0/7/130738740/e8d4fefaabd.pdf
    • http://files.barrvillemc.org/uploads/1/3/0/7/130776118/423244.pdf
    • http://files.victordelestre.com/uploads/1/3/2/7/132740814/xixunosiburul-zarumibupa-wumubolemudama-bapovibegigo.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/21583018511.pdf
    • https://cdn.shopify.com/s/files/1/0434/0636/0730/files/psc_biology_questions.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/26842507766.pdf
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/john_b_watson_behaviorism_theory.pdf
    • https://cdn.shopify.com/s/files/1/0435/0391/1076/files/axis_bank_current_account_debit_card_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/3554/1151/files/goldstein_classical_mechanics.pdf
    • https://cdn.shopify.com/s/files/1/0434/7723/7917/files/35010185858.pdf
    • https://cdn.shopify.com/s/files/1/0432/6470/4662/files/lamopuxerageluxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38138836364.pdf
    • https://cdn.shopify.com/s/files/1/0433/1172/6750/files/laxisezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5136/9127/files/5888077842.pdf
    • https://cdn.shopify.com/s/files/1/0433/9341/7366/files/73865747687.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4017/files/a_travs_del_vaso_acordes.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000091bb.bin
28af29e335b280a12cd6703a523cbb6e34477ae86e3da2ec7987d2c1b2ea6f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91BB 4908 bytes
font_01_sfnt_off0000a27c.bin
33e27ce500d8fd6f065213cce4dfaca11a9eaf8ad90ef5bfe83cabb69fed881d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA27C 14656 bytes
font_02_sfnt_off0000cfda.bin
8d971e6d57531a1973e4c74cbe83842513d2524a98b3fc5ba99f8fa549cd9abf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDA 16308 bytes
font_03_sfnt_off0000e576.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 4324 bytes

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