Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a0396d3fb3bbce…

MALICIOUS

PDF

43.3 KB Created: 2020-08-27 12:45:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 161c7ee7adc0da2f4d0ef233c953f489 SHA-1: 39dac2e13e5d3be35d8ce3914cbb8a501c27ebb6 SHA-256: 83a0396d3fb3bbce691583bcc428645e91283e4288bf56210928cc6e88930bb3
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to a '2007 honda civic workshop manual' and a URL that appears to be a redirector. This suggests a phishing or social engineering attack aiming to lure users to a malicious site.

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=2007+honda+civic+workshop+manual
    • http://romoti.stuartsnyder.net/uploads/1/3/0/8/130873995/keroxobubiz_suzirokuligux_larovofiso_biguzebuzawalaj.pdf
    • https://cdn.shopify.com/s/files/1/0437/0454/9544/files/dacor_wall_oven.pdf
    • https://cdn.shopify.com/s/files/1/0431/4297/1553/files/610228142.pdf
    • https://cdn.shopify.com/s/files/1/0432/5936/3478/files/5607818128.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9051/files/32143622751.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4885/files/xomixokakijakiwonuvi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2207/2480/files/97306951100.pdf
    • https://cdn.shopify.com/s/files/1/0429/0071/7724/files/calculus_2nd_edition_briggs.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/building_background_photo.pdf
    • https://cdn.shopify.com/s/files/1/0432/2335/1458/files/wunilijaxum.pdf
    • https://cdn.shopify.com/s/files/1/0434/9244/2264/files/bogavuxuzovejarebadu.pdf
    • https://cdn.shopify.com/s/files/1/0463/0960/5541/files/afp._gov._au_police_check_form.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005d1f.bin
c243c6ea940036e0f90eb732cf56c448ab3e3d945232a8a086f2aded9ee1f322
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D1F 5472 bytes
font_01_sfnt_off00006f84.bin
7d3fabf07fbb50a3705ff86a472d601a10bab1150649419a946f205df0ecb1e4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6F84 10232 bytes
font_02_sfnt_off00009295.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9295 4324 bytes