Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fdc4947d5b772fd…

MALICIOUS

PDF

36.3 KB Created: 2020-08-23 06:29:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 268b8e530a5a8eb1cc17ab8ac8030bfc SHA-1: bc334e51d7a807bb43401fe5c74c136af87e0ad6 SHA-256: 1fdc4947d5b772fdbab1fe9ca3510f526643c98b0c878fa217f48c3df31728a7
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URLs, particularly the one pointing to 'ttraff.ru', are indicative of a phishing or malware distribution scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of links suggests a broad attempt to lure users to potentially harmful 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.ru/pify?keyword=apostila+alem%25C3%25A3o+basico+pdf
    • http://jukidefu.elsolmarketing.com/uploads/1/3/2/6/132681394/7191470.pdf
    • http://files.aminatoseese.com/uploads/1/3/0/9/130969748/8efd0.pdf
    • https://cdn.shopify.com/s/files/1/0430/3749/1354/files/fadozi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0756/6239/files/daseruxotetigokuw.pdf
    • https://cdn.shopify.com/s/files/1/0434/2385/8845/files/44703627614.pdf
    • https://cdn.shopify.com/s/files/1/0436/0234/6148/files/vusijojitiziwavelogusuzo.pdf
    • https://cdn.shopify.com/s/files/1/0436/8033/3989/files/android_ndk_samples_github.pdf
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/mivama.pdf
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/jibixiximero.pdf
    • https://cdn.shopify.com/s/files/1/0436/2128/6050/files/53288051738.pdf
    • https://cdn.shopify.com/s/files/1/0437/5078/5173/files/67063135937.pdf
    • https://cdn.shopify.com/s/files/1/0429/1765/8780/files/ejercicios_de_anualidades_matemticas_financieras.pdf
    • https://cdn.shopify.com/s/files/1/0433/3453/3275/files/keto_breakfast_cookbook.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_off000049e1.bin
3cb58c4190aff88ed964853f33ce01313f3978eacb2ca7cd78632752d91de353
pdf-font-stream PDF embedded font (sfnt) at offset 0x49E1 5652 bytes
font_01_sfnt_off00005c6c.bin
e61acf3eb779533fc947d4cc00b86e921f0ceb94e1350aa038c693b6e9696d64
pdf-font-stream PDF embedded font (sfnt) at offset 0x5C6C 12676 bytes