Malicious PDF — malware analysis report

Static analysis result for SHA-256 89f234019b308acd…

MALICIOUS

PDF

40.9 KB Created: 2020-08-13 16:51:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea498c9bda0ee2392599b8e37642e2fc SHA-1: 43b62ce451dc19b50a2a2f73cc8696588ba4f931 SHA-256: 89f234019b308acdb02270dfba065fd7a3b2b45c5c700022af0422cf74748f7d
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one specifically identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is heavily obfuscated and contains a URL that appears to be part of a link farm strategy, likely intended to manipulate search engine results or lead users to malicious sites.

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.com/wb?keyword=mpfl%20reconstruction%20technique%20pdf
    • http://files.diamondentllc.com/uploads/1/3/1/8/131871614/mugawowibog_fofex_suwamurukup_gexosoka.pdf
    • http://files.letsatbrown.org/uploads/1/3/1/4/131437625/buguj_kepajo_gerubareviban_korogalogap.pdf
    • http://wagitedo.thelostartoffemininity.com/uploads/1/3/0/7/130776445/1677735.pdf
    • http://files.vividoptical.ca/uploads/1/3/2/7/132740399/fejilomoruxidab-jonej-jewazuvubi-vatusuzefe.pdf
    • https://cdn.shopify.com/s/files/1/0437/9561/1810/files/cristina_aguilera_not_myself_tonight.pdf
    • https://cdn.shopify.com/s/files/1/0435/2537/4103/files/zazorakijadirafoxav.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nefodegaxinavikiva.pdf
    • https://cdn.shopify.com/s/files/1/0438/8916/4440/files/queen_s_gambit_declined_vienna.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/kataromusujinune.pdf
    • https://cdn.shopify.com/s/files/1/0430/7514/1783/files/54466799265.pdf
    • https://cdn.shopify.com/s/files/1/0438/5737/9488/files/wirorisumunanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7547/7416/files/taliletilepoxekibunod.pdf
    • https://cdn.shopify.com/s/files/1/0433/1434/8197/files/97381940347.pdf
    • https://cdn.shopify.com/s/files/1/0435/2563/6248/files/begofevugivu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/strategic_change_management_process.pdf
    • https://cdn.shopify.com/s/files/1/0431/4998/3905/files/65127039481.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_off0000633c.bin
77aaae084cfabc2c7145bf97e89afed9e4342127d9e48a5a26c77c1b16f56297
pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 5164 bytes
font_01_sfnt_off000074c5.bin
c6db155655b4906abae436d571cdc11f55a0f42c5a0b631a740993de9221023f
pdf-font-stream PDF embedded font (sfnt) at offset 0x74C5 9940 bytes