Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3aa9788319817b9…

MALICIOUS

PDF

58.2 KB Created: 2020-07-27 23:16:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c52d552d4180d0146440c76c9bb660e8 SHA-1: e73a1ac35b80df9c8b298a1f735752257e98d909 SHA-256: f3aa9788319817b9da2cfcd7e6724d5899e1279e99373d2db325acc1936fc118
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector, ttraff.com. The document body, though heavily obfuscated, contains text that appears to be a lure for 'Aspen plus 7.2 free', suggesting a software download scam. The presence of a large number of external PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning tactic to drive traffic 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/pify?keyword=aspen+plus+7.+2+free
    • http://files.creavastudio.com/uploads/1/3/2/6/132695336/rutuvokotutumiti.pdf
    • http://files.slowgeatery.com/uploads/1/3/0/7/130739517/mamigodaporegetagina.pdf
    • http://files.lizbalfourbasketmaking.com/uploads/1/3/0/8/130814715/sovaza_widumunod_sukapafa_jagazegareru.pdf
    • https://cdn.shopify.com/s/files/1/0435/1413/4692/files/suzanatidijopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wojifuxazax.pdf
    • https://cdn.shopify.com/s/files/1/0434/8549/5453/files/49209234208.pdf
    • https://cdn.shopify.com/s/files/1/0430/5561/2058/files/71144866841.pdf
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/muluruzefigupefix.pdf
    • https://cdn.shopify.com/s/files/1/0431/4942/6839/files/puvanevis.pdf
    • https://cdn.shopify.com/s/files/1/0428/2646/5436/files/nitotiputavaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2155/files/vesonijerofulodosuleledow.pdf
    • https://cdn.shopify.com/s/files/1/0431/3153/5524/files/70381955721.pdf
    • https://cdn.shopify.com/s/files/1/0430/0688/6051/files/84461203690.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/
    • https://cdn.shopify.com/s/files/1/0437/5996/0218/files/muluru

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a800.bin
d64947c0b113fd514fd5f116bc578ccc4dff6cece3025da7b028b6aab103f384
pdf-font-stream PDF embedded font (sfnt) at offset 0xA800 4564 bytes
font_01_sfnt_off0000b790.bin
f7f112998b0d13c88211784eaf9f60251518392dad118ac419fafefc9013d004
pdf-font-stream PDF embedded font (sfnt) at offset 0xB790 10692 bytes