Malicious PDF — malware analysis report

Static analysis result for SHA-256 55b95cd57f0a14dd…

MALICIOUS

PDF

41.3 KB Created: 2020-08-29 12:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b3b809e127d5f533e3f907007cb2b9b SHA-1: 5920f66e909d1e53c4618b7b3fc366f1bb8ab1ea SHA-256: 55b95cd57f0a14dd626469e1b0d94882c51ef712f7cd9c0c6f3269434eeb6d65
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body. The ML classifier strongly flagged this PDF as malicious. The primary IOC is the redirector URL, which is likely used to lead the user to a malicious site. No scripts were extracted from this sample.

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=formato+matriz+foda
    • https://cdn.shopify.com/s/files/1/0445/4576/9636/files/common_russian_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0436/9301/5195/files/adverb_exercises_for_class_7_with_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/8178/5753/files/balasurawununisowevi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6772/7269/files/seponet.pdf
    • https://cdn.shopify.com/s/files/1/0437/6985/6158/files/53850442336.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/titles_for_baronets_crossword_answers.pdf
    • https://cdn.shopify.com/s/files/1/0431/3546/7682/files/53141235939.pdf
    • https://cdn.shopify.com/s/files/1/0447/9831/2609/files/22356376272.pdf
    • https://cdn.shopify.com/s/files/1/0463/2634/9985/files/bafg_antrag_formblatt_1_berlin.pdf
    • https://cdn.shopify.com/s/files/1/0434/3103/5032/files/9_snf_almanca_ders_kitab_cevaplar_baak_yaynlar.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/80884551140.pdf
    • https://cdn.shopify.com/s/files/1/0441/2165/3400/files/lagu_berry_good_oh_oh_ilkpop.pdf
    • https://cdn.shopify.com/s/files/1/0430/7084/9181/files/65055582111.pdf
    • https://cdn.shopify.com/s/files/1/0433/5609/4615/files/hydrology_and_floodplain_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0461/8544/7587/files/gastroenteritis_infecciosa_aguda.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_off0000606c.bin
e3ad417aec7714046f0f009c2cdad47667bcd62ece15f143262c6f2409b2e401
pdf-font-stream PDF embedded font (sfnt) at offset 0x606C 4848 bytes
font_01_sfnt_off000070d5.bin
55a8ebdd44c4aa0c6c2c7a339a5e45ad66197fd1cecdc19dee46eef4b7c4098d
pdf-font-stream PDF embedded font (sfnt) at offset 0x70D5 12956 bytes