Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdc076d1396f6ed3…

MALICIOUS

PDF

37.1 KB Created: 2020-08-09 21:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc93463bdc3a5bf79656a845b415523e SHA-1: e3253a06653a67c2389ebdc7ea1ca91ad8c46a53 SHA-256: cdc076d1396f6ed341e0dd728529dd72e220506009046d52912ea55d0d80d8c2
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for redirecting users to malicious sites. One such link, 'https://ttraff.com/pify?keyword=bs+botany+books+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting it's the primary lure. The presence of a large number of external PDF links further supports the classification as a link farm, designed to obscure the malicious destination.

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=bs+botany+books+pdf
    • http://rabadaroj.myvitalessentials.com/uploads/1/3/1/0/131070374/fobagon-tivorekinu-kilosavefetow.pdf
    • http://files.shelbyrking.com/uploads/1/3/2/7/132741375/rejixewu.pdf
    • http://files.surodhoni.com/uploads/1/3/0/8/130873715/c5ca72ffd227bb3.pdf
    • http://files.saborlatinotacuari.com/uploads/1/3/2/6/132681928/4565925.pdf
    • https://cdn.shopify.com/s/files/1/0440/9756/8920/files/51385868853.pdf
    • https://cdn.shopify.com/s/files/1/0429/4190/7100/files/kexoguli.pdf
    • https://cdn.shopify.com/s/files/1/0435/9671/0050/files/ez_go_golf_cart_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/avery_8162_template.pdf
    • https://cdn.shopify.com/s/files/1/0432/5474/3200/files/ganejo.pdf
    • https://cdn.shopify.com/s/files/1/0433/4305/2953/files/genekimakokeseru.pdf
    • https://cdn.shopify.com/s/files/1/0437/6815/2216/files/88692458182.pdf
    • https://cdn.shopify.com/s/files/1/0430/4211/1650/files/nosuvidizatadav.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5797/files/14158949671.pdf
    • https://cdn.shopify.com/s/files/1/0433/8787/9580/files/86723065891.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_off000048a5.bin
ce3aaceb6b2a6273824a17dc3874a0d957678d847192a461f317dc8386b584bd
pdf-font-stream PDF embedded font (sfnt) at offset 0x48A5 5264 bytes
font_01_sfnt_off00005ab2.bin
28a6ea2ead12f60e27f2a6922b72f6ca998a20f3d0b733fe1bc123bcd8462989
pdf-font-stream PDF embedded font (sfnt) at offset 0x5AB2 14112 bytes