Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bdb8d44469cba35…

MALICIOUS

PDF

40.2 KB Created: 2020-08-19 10:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: edd45eb2e1f73de7ff622d3b529dc5a5 SHA-1: 9308584f5ccf2e71aceaad3fdb1535556af64517 SHA-256: 1bdb8d44469cba35ad4c8427a73080c04503085ff5a26c7d0e2cb2e7f8c3f9d6
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a high number of embedded links pointing to a redirector and a link farm. The document body contains text that appears to be related to a '4 pics 1 word' game, likely a lure to entice users to click the malicious links. The primary malicious URL identified is https://ttraff.cc/pify?keyword=248+answer+4pic+1+word, which is a known malicious redirector.

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=248+answer+4pic+1+word
    • http://kewamip.amystreasuresdesign.com/uploads/1/3/0/7/130739098/munopizo.pdf
    • http://defoxa.customstitchnmend.com/uploads/1/3/1/8/131856124/1900bc8.pdf
    • http://files.babydollsheepaustralia.com/uploads/1/3/0/8/130873822/207599.pdf
    • http://files.prettybakedqueens.com/uploads/1/3/1/3/131379832/6399225.pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/81556497347.pdf
    • https://cdn.shopify.com/s/files/1/0432/7663/2214/files/78120264845.pdf
    • https://cdn.shopify.com/s/files/1/0448/5106/9085/files/94049212802.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/xufumasikanezo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/gufexenat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5697/1432/files/12116198334.pdf
    • https://cdn.shopify.com/s/files/1/0435/2576/7320/files/teacher_aptitude_test_questions.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/average_value_of_sine_wave.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_off000052a7.bin
2acb237928879a05c3f8475baf7cbbef9f8c683efef3f3e7fb3625c6fd706a5c
pdf-font-stream PDF embedded font (sfnt) at offset 0x52A7 5204 bytes
font_01_sfnt_off0000645e.bin
a6642b096757e28d3a571cca0a498ef9e488ffe06797c3979e80c42146e6f88a
pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 10016 bytes
font_02_sfnt_off00008625.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x8625 4324 bytes