Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8a83d1d84743d4d…

MALICIOUS

PDF

45.4 KB Created: 2020-08-03 06:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d6ab1253057308eb319cf829bad4763 SHA-1: 928d351ad99a6a91ea2d26d66c6ba84c30f46753 SHA-256: a8a83d1d84743d4d847ac37c3bb9ced482573982ba6acb372e8a0262bc0101be
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.com, which is known malicious infrastructure. The document body, though heavily obfuscated, contains text related to 'Zumdahl chemistry 7th edition pdf' and the malicious URL, suggesting a lure to download or access a malicious file disguised as an academic resource. The ML classifier also strongly indicated maliciousness.

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=zumdahl+chemistry+7th+edition+pdf
    • http://files.sewsewquilt.com/uploads/1/3/1/3/131380045/ee664f.pdf
    • http://files.daniellerobidoux.com/uploads/1/3/0/8/130874109/wonodomirixujazifur.pdf
    • http://files.mmvbrandon.com/uploads/1/3/1/1/131163867/5854372.pdf
    • http://files.pulsarevent.com/uploads/1/3/0/8/130874134/9214878.pdf
    • http://files.addisonedge.com/uploads/1/3/1/3/131383482/ab4c836.pdf
    • https://cdn.shopify.com/s/files/1/0433/1631/4277/files/sopixize.pdf
    • https://cdn.shopify.com/s/files/1/0431/3464/8474/files/60617480527.pdf
    • https://cdn.shopify.com/s/files/1/0429/3135/5807/files/32247523125.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/denalana.pdf
    • https://cdn.shopify.com/s/files/1/0427/6443/5612/files/99707590815.pdf
    • https://cdn.shopify.com/s/files/1/0429/6605/7116/files/bose_awr1-_1w_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0225/6795/files/menoravage.pdf
    • https://cdn.shopify.com/s/files/1/0434/1969/7308/files/botifope.pdf
    • https://cdn.shopify.com/s/files/1/0435/2655/3755/files/togutixudu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0110/9920/files/27611136968.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/marvel_heroes_omega_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/59664200608.pdf
    • https://cdn.shopify.com/s/files/1/0440/5372/5334/files/hewlett_packard_cm2320nf.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_off00007316.bin
42d3f3023d77ab7bdb28f46ae77e57fbed01947df67c30e3c3bd236df22b3db3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 5536 bytes
font_01_sfnt_off000085cf.bin
df5b848e61a199c96dd0c1eade860a8e5e33b556320f21f8bf24d450aff0c40e
pdf-font-stream PDF embedded font (sfnt) at offset 0x85CF 10152 bytes