Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a6a5c2a54e7883…

MALICIOUS

PDF

49.8 KB Created: 2020-08-04 06:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeec2f0b64f92af19e00ee187ee5a6de SHA-1: b88de6cfa47a1334a9c855d66255f140dc247c36 SHA-256: 71a6a5c2a54e7883af3e2a97046e4b3e8638c185d33f312397673ac0ccfa93aa
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector at ttraff.com. The document body, though obfuscated, contains text related to a dictionary and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly indicated maliciousness, and the presence of a link farm further supports a malicious intent 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.com/pify?keyword=dictionary+of+synonyms+and+antonyms+alan+spooner+pdf
    • http://files.hoffmannlabradors.com/uploads/1/3/2/6/132682892/vamigid.pdf
    • http://files.kiuyanran.com/uploads/1/3/2/7/132740435/liris.pdf
    • http://files.drlashawndenisewitt.com/uploads/1/3/0/9/130969986/2209446.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1187/3695/files/wetapijofovigamejomubotav.pdf
    • https://cdn.shopify.com/s/files/1/0431/6535/2093/files/xotepiwixisovebokix.pdf
    • https://cdn.shopify.com/s/files/1/0435/7586/9599/files/96608243876.pdf
    • https://cdn.shopify.com/s/files/1/0438/6262/2358/files/pedawezotezatofubo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5049/2316/files/tadokagube.pdf
    • https://cdn.shopify.com/s/files/1/0433/3663/0422/files/git_list_remote_tags.pdf
    • https://cdn.shopify.com/s/files/1/0434/3214/9148/files/vipam.pdf
    • https://cdn.shopify.com/s/files/1/0430/3175/6957/files/lusamexo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3080/6679/files/zokapalodoxagesaf.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067d7.bin
c56f18f7bbd8b42705707f15814cbe4e7f5c292cb4a5a82978fcfec76635ffbb
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D7 5192 bytes
font_01_sfnt_off0000796e.bin
6abd336fa0f1219a3ea42d4462cbbdf98bbac37a1b30abe1cbf664d826d1e69f
pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 15744 bytes
font_02_sfnt_off0000a9dc.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xA9DC 4324 bytes