Malicious PDF — malware analysis report

Static analysis result for SHA-256 44a2c9519b945047…

MALICIOUS

PDF

57.3 KB Created: 2020-08-17 15:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 336838506145c614851a5653f964f40d SHA-1: 72b43990d17d03360dbffbcf7a77de8aefb8aa33 SHA-256: 44a2c9519b9450477fccd3e2a6809115cb0258310320a0e6536fd1b7ae5380bb
152 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as legitimate PDF downloads, but the primary link redirects to a known malicious redirector. The document body, though heavily obfuscated, contains the malicious URL. This indicates a phishing or scam attempt to lure users to malicious infrastructure.

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.cc/pify?keyword=fisiopatologia+de+insuficiencia+cardiaca+pdf+2018
    • http://files.healinghavenacu.com/uploads/1/3/2/7/132741535/zovovidox-vimezexaxigotu-wewuf-gegolo.pdf
    • http://pedefamez.jojasperdean.com/uploads/1/3/1/4/131409546/kitazu_munevidedatuxo_sokuviterara.pdf
    • http://files.pomfretphotography.com/uploads/1/3/1/4/131406352/a404f898ab75ba.pdf
    • http://files.ccfcovid19resources.com/uploads/1/3/0/8/130874369/mokaz.pdf
    • http://pedefamez.jojasperdean.com/uploa
    • https://cdn.shopify.com/s/files/1/0428/5969/2198/files/tujugowovini.pdf
    • https://cdn.shopify.com/s/files/1/0430/4971/3817/files/94087931982.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gekubamunanapomokavonata.pdf
    • https://cdn.shopify.com/s/files/1/0429/0061/9423/files/78158736111.pdf
    • https://cdn.shopify.com/s/files/1/0431/7007/0690/files/wuruziwejunadirebadotoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/0849/9618/files/14077018738.pdf
    • https://cdn.shopify.com/s/files/1/0437/0841/6168/files/middle_dj_snake_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/8801/0659/files/25678248787.pdf
    • https://cdn.shopify.com/s/files/1/0427/9812/1119/files/jcb_3dx_specification.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_off00009e3e.bin
233b7f6556f4c6463646e6141803936b0fc799e462bbbfa1f8be7730667663b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3E 5796 bytes
font_01_sfnt_off0000b210.bin
cbfddb26e6f3a4d2c7047cddfeb55e0f673e72dfb45759cf01029b569fbb0c2e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB210 11056 bytes