Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d99489ca862214d…

MALICIOUS

PDF

47.3 KB Created: 2020-07-30 07:23:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1eb1eaf4c2696c05bd74eb5b167f54d SHA-1: 266f8088afb0e0d983a963e526f4f3ea32783dff SHA-256: 4d99489ca862214d58e806213fa8200ac70d9d99f20c7e8e650d723c8d595f7d
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector, indicating an attempt to lead the user to malicious content. The embedded URL and the heuristic firings strongly suggest a phishing or redirection attack. The document body, though heavily obfuscated, contains text related to an internship application, reinforcing the lure.

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=application+letter+for+internship+in+finance+pdf
    • http://files.greateventsrecording.com/uploads/1/3/1/4/131408465/finife.pdf
    • http://files.onwardbounddogs.com/uploads/1/3/2/7/132710783/dunabamedawij.pdf
    • http://files.payitforwarduk.net/uploads/1/3/0/7/130739783/731354812d.pdf
    • http://files.dolcevitaspomeranians.com/uploads/1/3/2/6/132682171/45fe172e65.pdf
    • https://cdn.shopify.com/s/files/1/0430/5921/6537/files/bumaxuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9096/8729/files/90969425291.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/zoguzebunoredanu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6176/3480/files/91994369797.pdf
    • https://cdn.shopify.com/s/files/1/0432/8977/2187/files/29728192625.pdf
    • https://cdn.shopify.com/s/files/1/0428/3380/5471/files/2391765764.pdf
    • https://cdn.shopify.com/s/files/1/0434/7356/7894/files/napemibevitabimu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/50996037130.pdf
    • https://cdn.shopify.com/s/files/1/0433/9888/9635/files/32614848588.pdf
    • https://cdn.shopify.com/s/files/1/0430/9843/9837/files/29361291479.pdf
    • https://cdn.shopify.com/s/files/1/0440/8446/1720/files/purel.pdf
    • https://cdn.shopify.com/s/files/1/0433/0877/7637/files/zowuwenefufomiwegulurit.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/58841665442.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_off00007a8f.bin
9744de02f3559ae3acf33272ba9b81672a664b1a3db7f8f76b81ba9b334ab207
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A8F 5020 bytes
font_01_sfnt_off00008b86.bin
be6a608dd69859d8ae3d8c076f806cd6e776bb122995f76147acba9b8e458b54
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B86 10496 bytes